INVERSE TRIGONOMETRIC FUNCTION. Contents. Theory Exercise Exercise Exercise Exercise
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1 INVERSE TRIGONOMETRIC FUNCTION Toic Contents Page No. Theory 0-06 Eercise Eercise Eercise Eercise Answer Key 0 - Syllabus Inverse Trigonometric Function (ITF) Name : Contact No. ARRIDE LEARNING ONLINE E-LEARNING ACADEMY A-79 indra Vihar, Kota Rajasthan 00 Contact No
2 INVERSE TRIGONOMETRIC FUNCTION. Princial Values & Domains of Inverse Trigonometric/Circular Functions: Function Domain Range (i) y = sin where - y (ii) y = cos where 0 y (iii) y = tan where Î R - < y < (iv) y = cosec where - or ³ - y, y ¹ 0 (v) y = sec where or ³ 0 y ; y ¹ (vi) y = cot where Î R 0 < y < NOTE: (a) st quadrant is common to the range of all the inverse functions. (b) rd quadrant is not used in inverse functions. (c) th quadrant is used in the clockwise direction i.e. - y 0. (d) No inverse function is eriodic. (See the grahs on age ). Proerties of Inverse Trigonometric Functions: A (i) sin (sin ) =, (ii) cos (cos ) =, (iii) tan (tan ) =, Î R (iv) cot (cot ) =, Î R (v) sec (sec ) =,, ³ (vi) cosec (cosec ) =,, ³ These functions are equal to identity function in their whole domain which may or may not be R.(See the grahs on age ) B (i) sin (sin ) =, - (ii) cos (cos ) = ; 0 (iii) tan (tan ) = ; - < < (iv) cot (cot ) = ; 0 < < (v) sec (sec ) = ; 0, ¹ (vi) cosec (cosec ) = ; ¹ 0, - These functions are defined on R, but they are equal to identity function for a short interval of only. (See the grahs on age 6) C (i) sin (-) = - sin, (ii) tan (-) = - tan, Î R (iii) cos (-) = - cos, (iv) cot (-) = - cot, Î R The functions sin, tan and cosec are odd functions and rest are neither even nor odd. D (i) cosec = sin ;, ³ (ii) sec = cos ;, ³ (iii) cot ì ï tan = í ï + tan î ; > 0 ; < 0 A-79 Indra Vihar, Kota Rajasthan 00 Page No. #
3 E (i) sin + cos =, (ii) tan + cot =, Î R (iii) cosec + sec =, ½½ ³ F (i) sin (cos ) = cos (sin ) = -, (ii) tan (cot ) = cot (tan ) =, Î R, ¹ 0 (iii) cosec (sec ) = sec (cosec ) =, ½½ > -. Identities of Addition and Substraction: A (i) sin + sin y = sin - y + y - ê, ³ 0, y ³ 0 & ( + y ) = - sin - y + y - ê, ³ 0, y ³ 0 & + y > Note that: + y Þ 0 sin + sin y + y > Þ < sin + sin y < (ii) cos + cos y = cos y y, ³ 0, y ³ 0 ê (iii) tan + tan y = tan + y, > 0, y > 0 & y < - y = + tan + y, > 0, y > 0 & y > - y =, > 0, y > 0 & y = Note that : y < Þ 0 < tan + tan y < ;y > Þ < tan + tan y < B (i) sin - sin y = sin - y - y -, ³ 0, y ³ 0 ê (ii) cos - cos y = cos y y, ³ 0, y ³ 0, y ê - y (iii) tan - tan y = tan, ³ 0, y ³ 0 + y Note: For < 0 and y < 0 these identities can be used with the hel of roerties (C) i.e. change and y to - and - y which are ositive. A-79 Indra Vihar, Kota Rajasthan 00 Page No. #
4 ê sin ê C (i) sin æ - ê - sin = ê ê- ê ( + sin ) if if if > < - (ii) cos ( - ) = ê ê cos - cos if if ³ 0 < 0 (iii) tan - = tan ê ê + tan ê- ( - tan ) if if if < < > (iv) sin + = tan ê ê - tan ê- ( + tan ) if if if > < - (v) cos + tan = ê - tan if if ³ 0 < 0 + y + z - yz D If tan + tan y + tan z = tan ê - y - yz - z if, > 0, y > 0, z > 0 & (y + yz + z) < NOTE: (i) If tan + tan y + tan z = then + y + z = yz (ii) If tan + tan y + tan z = then y + yz + z = (iii) tan + tan + tan = (iv) tan + tan + tan = A-79 Indra Vihar, Kota Rajasthan 00 Page No. #
5 Inverse Trigonometric Functions Some Useful Grahs. (i) y = sin, ½½, y yî ê -, (ii) y = cos, ½½, y Î [0, ] Ù y O - - O - (iii) æ y = tan, Î R, y Î-, è, ø y (iv) - y = cot, Î R, y Î (0, ) y O O - - (v) æ y = sec, ½½ ³, yî (vi) ê 0, U, y = cosec ø è, ½½ ³, - y - O - y æ yî ê -,0 U 0, ø è - O - A-79 Indra Vihar, Kota Rajasthan 00 Page No. #
6 . (i) y = sin (sin ) = cos (cos ), Î [-, ], y Î [-, ] = ; y is aeriodic y y = )º O + (ii) y = tan (tan ) = cot (cot ) =, Î R, y Î R; y is aeriodic y )º O y = ¾¾¾¾¾¾¾¾¾¾¾¾¾¾¾¾ (iii) y = cosec (cosec ) = sec (sec ), ½½ ³, ½y½ ³, = ; y is aeriodic y y = ¾¾¾¾¾ - O y = ¾¾¾¾¾ - A-79 Indra Vihar, Kota Rajasthan 00 Page No. #
7 6. (i) y = sin (sin ), Î R, yî -, ê, is eriodic with eriod Ùy y =- ( + ) - )º O y = + y = y = - y = - - (ii) y = cos (cos ), Î R, y Î [0, ], is eriodic with eriod y y = + y = - y = y = O - (iii) ì ü æ y = tan (tan ), Î R - í( n ) nîiý, y Î-, î þ è is eriodic with eriod ø Ùy - y = + - y = + y = - O - y = - y = - - (iv) ì ü æ y = sec (sec ), y is eriodic with eriod ; Î R - í( n ) nîiý, yî 0, î þ ê U, ø è y y = + y = - y = y = O - - A-79 Indra Vihar, Kota Rajasthan 00 Page No. # 6
8 PART - I : OBJECTIVE QUESTIONS * Marked Questions are having more than one correct otion. Section (A) : Fundamentals of ITF æ A. The value of sin è æ + sin ø è ø is equal to : (A) 7 (B) 0 (C) (D) L NM A-. sin - sin - = F HG IO KJ QP (A) (B) (C) (D) A-. The rincial value of F I HG K J F + sin sin I HG K J is - cos cos (A) (B) / (C) / (D) / A-. cosec (cos ) is real if : (A) Î [, ] (C) is an odd multile of (B) Î R (D) is a multile of A-. If cos [tan{sin(cot- )}] = y, then : (A) y = (B) y = (C) y = - (D) y = 0 A-6.* If a satisfies the inequation > 0, then a value eists for : (A) sin a (B) cos a (C) sec a (D) cosec a Section (B) : Inter Conversion and Proerties of ITF B. The value of sin æ - cos + cos æ - sin è ø è ø 7 9 (A) (B) 6 6 is- 6 (C) 9 (D) None of these A-79 Indra Vihar, Kota Rajasthan 00 Page No. # 7
9 F B-. The value of sin cos I HG K J is - (A) (B) 7 (C) 0 (D) 0 B-. The value of ïì æ tan í cos ïî è æ ïü - - / ý è 7 ø ø ïþ is - (A) (B) (C) (D) B-. cos[tan {sin (cot )}] is equal to- (A) + + (B) + + (C) + + (D) None of these B-. tandcos i is equal to : (A) - (B) + (C) + (D) - æ B-6. If = tan cos - + sin ; æ æ y = cos cos è è8øø, then : (A) = y (B) y = (C) tan = -(/)y (D) tan = (/)y B-7. If sin + sin y =, then cos + cos y is equal to : (A) (B) (C) 6 (D) B-8. If sin cos tan, [0,] q = + - Î, then the interval in which q lies is given by : (A) ê0, (B) ê, (C) ê0, (D) ê, æ B-9. If = cos + æ sin statements holds good? + tan ( ) and y = cos æ æ sin sin è ø,then which of the following (A) y = cos (B) 6 y = cos (C) 6 cos y = (D) None of these ì æ ü B0.* The value of cos ê cos ícos - ý î þ is : æ 7 (A) cos - (B) sin æ 0 æ (C) cos æ (D) - cos A-79 Indra Vihar, Kota Rajasthan 00 Page No. # 8
10 B.* If 0 < <, then tan - + is equal to : (A) + cos (B) cos (C) sin - (D) tan + - B.* If cos = tan, then : (A) = æ (B) = æ + (C) sin (cos ) = æ (D) tan (cos ) = æ Section (C) : Addition of ITF æ C. If < 0 then value of tan () + tan (A) (B) is equal to : (C) 0 (D) none of these C-. The value of tan sin - æ tan - æ ê + is : (A) 6 7 (B) 7 6 (C) 7 (D) 7 6 C-. cos æ + cos æ is equal to : (A) cos æ 6 (B) cos æ - 6 æ6 (C) cos 6 (D) none of these æ æ C-. tan + tan is equal to : è ø è ø (A) (B) (C) (D) none of these C-. tan + tan = cosec, the is equal to : (A) (B) (C) - (D) none of these C-6. If q = cot 7 + cot 8 + cot 8, then cotq is equal to : (A) (B) (C) (D) Section (D) : ITF Equations æ D. The solution of the equation sin tan - æ sin - = 0 is : 6 (A) = (B) = - (C) = (D) none of these A-79 Indra Vihar, Kota Rajasthan 00 Page No. # 9
11 D-. If sin + cot æ =, then is equal to : (A) 0 (B) D-. ( sin ) ( sin y) ( sin )( sin y) (C) + + =, then +y is equal to : (A) (B) / (C) (D) / (D) D-. The equation sin = sin a has a solution for : (A) all real values of a (B) a < (C) a > (D) - a D-. If n å i= cos - a i = 0, then n å i= a i is equal to : (A) n (B) n (C) 0 (D) none of these D-6. The value of a for which + a + sin ( + ) + cos ( + ) = 0, is : æ (A) + (B) + (C) - + D-7.* sin > cos holds for : æ (D) + (A) all values of (B) Î æ 0, è ø (C) Î æ, è ø (D) = 0.7 D-8. If cot n >, n Î N, then the maimum value of 6 n is : (A) (B) (C) 9 (D) none of these D-9. The solution of the inequality - (tan ) - tan + ³ 0 is : (A) (, tan ] È [tan, ) (B) (, tan ] (C) (, tan] È [tan, ) (D) [tan, ) æ D0.* If 6 sin 6 + =, then : 7 (A) = (B) = (C) = (D) = D.* If sin + sin y + sin z =, then : 9 (A) 00 + y 00 + z y + z = 0 (B) + y + z 6 0 y 0 z 60 = y + z (C) 0 + y + z = 0 (D) = (yz ) D.* The sum n å tan is equal to : n= n - n + (A) tan + tan (B) tan (C) (D) sec (- ) A-79 Indra Vihar, Kota Rajasthan 00 Page No. # 0
12 PART - II : MISCELLANEOUS OBJECTIVE QUESTIONS Comrehension : Comrehension # A young mathematician while redefining the inverse trigonometric functions chose the range of sin as ê, and of cos as [, ], i.e. ê f :[-,], f() = sin [ ] g:[ -,], g() = cos In his scheme of things he remodelled the whole eressions for sum, difference of these inverse functions, their derivatives & anti-derivatives. Solve the following roblems based on this new range of these inverse functions.. Identify the correct statement. (A) sin is an increasing function. (C) sin is a decreasing function. (B) cos is an increasing function. (D) sin and cos both are increasing function.. Which of the following function is constant function? (A) cos + sin (B) cos sin (C) cos + sin (D) cos + sin. Solution set of the equation sin + cos = is : (A) {0, } (B) {, } (C) (0, ) (D) none of these Comrehension # ì ì ï+q - <q<- ï--q - q<- ï tan ï ï (tan q) = í q - <q<, sin (sin q ) = í q - q ï ï ï ï ï-+q <q< ï -q <q î î ì -q, - q< 0 ï q = í q q ï î -q, < q cos (cos ), 0 Based on the above results, answer each of the following :. cos is equal to : (A) sin - if < < (B) sin - if < < 0 (C) sin - if < < 0 (D) sin - if 0 < <. sin is equal to : (A) cos - if < < (B) cos - if < < (C) cos - if 0 < < (D) cos - if 0 < < 6. cos is equal to : - - (A) tan if < < 0 (B) tan if < < 0 - (C) tan if 0 < < (D) + tan - if < < 0 A-79 Indra Vihar, Kota Rajasthan 00 Page No. #
13 Match the Column : 7. Match the column Column I Column II [.] and {.} reresent the greatest integer and fractional art functions resectively. (A) Number of solutions of [] = cos () (B) Number of solutions of sin = sgn() (q) (C) Number of solutions of {} = e (r) (D) Number of solutions of 8. Match the column Column - I + sin cos = {} (s) 0 Column - II (A) If >, then sec (cosec ) is equal to : () - - (B) If <, then sec (cosec ) is equal to : (q) - (C) If >, then cosec (sec ) is equal to : (r) - (D) If <, then cosec (sec ) is equal to : (s) not defined Assertion / Reason Tye Direction : Each question has choices (A), (B), (C), (D) and (E) out of which ONLY ONE is correct. (A) Statement is True, Statement- is True; Statement- is a correct elanation for Statement. (B) Statement is True, Statement- is True; Statement- is NOT a correct elanation for Statement. (C) Statement is True, Statement- is False. (D) Statement is False, Statement- is True. (E) Statement and Statement- both are False. 9. Statement : If a, b are roots of = 0 then cos a eist but not cos b, (a > b). Statement- : Domain of cos is [, ]. 0. Statement : tan (sec ) + cot (coses ) =. Statement- : tan q + sec q = = cot q + cosec q. A-79 Indra Vihar, Kota Rajasthan 00 Page No. #
14 PART - I : OBJECTIVE QUESTIONS * Marked Questions are having more than one correct otion.. If æ sin q sin =, then tan q is equal to è + cosq ø (A) / (B) (C) (D) -. If cos l + cos m + cos v = then lm + mv + vl is equal to (A) (B) 0 (C) (D) n å i i =. If sin - n å = n then i i = is equal to (A) n (B) n (C) nn ( +) (D) n (n - ). If =, the value of cos (cos + sin ) is : (A) - (B) (C) - (D) +. If tan =, then : (A) = tan (B) = tan (C) = tan (/) (D) = tan 8 6.* a, b and g are three angles given by a = tan ( - ), b = sin + æ - sin è ø and g = cos. Then (A) a > b (B) b > g (C) a < g (D) a > g 7. If X = tan () + tan () + tan () ; æ æ æ Y = tan + tan è + tan ø è ø è ø æ (A) 0 (B) - - tan 8 6 è ø then (X - Y) equals to: (C) tan (D) none of these A-79 Indra Vihar, Kota Rajasthan 00 Page No. #
15 8. Number of integral value(s) of satisfying - ( - ) ( ) tan - tan - 0, is : (A) (B) (C) (D) 9. Domain of the function (A) ên,n +,n ÎI f() = sin (sin) + cos (cos) is : (B) [(n + ), (n + )],nîi (C) [n, (n + )],nîi (D) ên +,n +,n ÎI 0. The function f() = cot ( + ) + cos + + is defined on the set S, where S = (A) {0,} (B) (0,) (C) {0, } (D) [,0]. Solution set of the inequality + > sin (sin) + cos (cos) is : (A) R (B) R {} (C) R {} (D) R { }. sin æ - - = sin is true if : (A) Î [0, ] (B) ê-, (C) ê-, (D) ê- ê,. The value of ì æaü ì æaü êtan í + sin ý+ tan í - sin ý î èbøþ î èbøþ, where ( 0 < a < b), is : (A) b a (B) a b (C) b - a b (D) b - a a. Which of the following is the solution set of the equation sin = cos + sin ( )? (A) ì ü í, ý î þ (B) ê, (C) ê, (D) ì ü í, ý î þ. Value of k for which the oint (a, sin a) (a>0) lies inside the triangle formed by + y = k with co-ordinate aes is : æ (A) +, æ (C) -,+ è ø æ æ æ (B) - +, + è ø (D) ( sin, +sin) ì ï 6. cos í îï ü ï ý þï = cos - cos holds for (A) (B) Î R (C) 0 (D) 0 A-79 Indra Vihar, Kota Rajasthan 00 Page No. #
16 ìï - sin + + sin üï 7. The value of cot í ý, where < <, is : ïî - sin - + sin ïþ (A) - (B) + (C) (D) - (sin ) + (cos ) 8.* If =l, then l Î [a,b] : (A) (a + b) is a rime number. (C) If l is an integer, it can only be 0 or. (D) b a = (B) l cannot be an integer. 7 9.* If f () = ì cos + cos í + - ü ý î þ then : (A) f æ = è ø æ (B) f è ø æ = cos (C) f è ø = æ (D) f è ø = cos PART - II : SUBJECTIVE QUESTIONS. Evaluate the following : (i) tan êcos æ + tan è ø - - (ii) sin æ ê -sin è ø (iii) cos (tan ) (iv) tan tan æ (v) cos æ sin è ø (vi) æ tan sin è + cot ø (vii) sin æ- ê -sin ê (viii) cos êcos ê æ- + 6 (i) tan - êtan () cos - êcos (i) sin êcos. Find sin (sin q), cos (cos q), tan (tan q) and cot (cot q) for q Î ê,. Evaluate each of the following : æ (i) sin sin + cos è ø æ (ii) sin (tan + tan - ) (iii) tan cos è ø. Prove each of the following : (i) tan = + cot = sin + = cos + when < 0. (ii) cos = sec = sin - = + tan - = cost - when << 0 A-79 Indra Vihar, Kota Rajasthan 00 Page No. #
17 . Find the value of sin (sin) + cos (cos0) + tan [ tan (-6)] + cot [ cot (0)]. 6. Solve the following inequalities: (i) cos > cos (ii) tan > cot. (iii) arccot - arccot + 6 > 0 7. If X = cosec tan cos cot sec sin a & Y = sec cot sin tan cosec cos a; where 0 a <. Find the relation between X & Y. Eress them in terms of 'a'. 8. Solve the following equation : sec a - sec b = sec b - sec a a ³ ; b ³, a ¹ b. 9. (i) Find all ositive integral solutions of the equation, tan + cot y = tan. (ii) If 'k' be a ositive integer, then show that the equation: tan + tan y = tan k has no non-zero integral solution. 0. If y cos cos a b + =a, then rove that. y y cos sin a b a - a+ b = a.. Prove that : (i) æ- æ- sin ê cot + cos ê cot = è ø è ø (ii) sin + cos + cot = 7 6. In a D ABC if Ð A = 90º, then rove that b c tan - + tan - = c + a a+ b.. If a sin b cos = c, then find the value of a sin + b cos.. (i) Prove that if 0 < A < æ + + = tan tana tan (cot A) tan (cot A) tan. (ii) Prove that : æ tan + sin - cos =-+ cot 0 -. æ æ æ +. Solve each of the following for : (i) sin + sin = (iii) tan + tan = (ii) tan + tan = (iv) sin + sin = sin. æ 6. Prove that sin + sin y = sin - y + y - when either y < 0 or è ø + y. 7. Find the sum of series : (i) tan + tan tan 9 n + n +... (ii) tan tan tan tan to n terms. (iii) sin + sin n - n- sin +... n (n + ) (iv) cot 7 + cot + cot + cot +... to n terms. A-79 Indra Vihar, Kota Rajasthan 00 Page No. # 6
18 PART-I IIT-JEE (PREVIOUS YEARS PROBLEMS) * Marked Questions are having more than one correct otion.. The number of real solutions of tan ( + ) + sin + + = is: [IIT-JEE 999, Part, (, 0), 80] (A) zero (B) one (C) two (D) infinite. 6 æ æ If sin cos è ø è ø = for 0 < <, then equals : [IITJEE-00, Scr. (, 0), ] (A) / (B) (C) / (D). Prove that, cos tan sin cot = + +. [IIT-JEE-00, Main (, 0), 60]. Domain of f () = sin () + is : [JEE 00 (screening)] 6 (A) æ - è, (B) ê -, ø (C) ê-, (D) ê-,. The value of for which sin ( cot ( + )) = cos (tan ) is : [IIT-JEE-00, Scr. (, ), 8] (A) / (B) (C) 0 (D) / 6. Match the column [IIT-JEE-007, Paer-, (6, 0), 8] Let (, y) be such that : sin (a) + cos (y) + cos (b y) = Column I Column II (A) If a = and b = 0, then (, y) () lies on the circle + y = (B) If a = and b =, then (, y) (q) lies on ( ) (y ) = 0 (C) If a = and b =, then (, y) (r) lies on y = (D) If a = and b =, then (, y) (s) lies on ( ) (y ) = 0 7. If 0 < <, then + [{ cos (cot ) + sin (cot )} ] / = [IIT-JEE 008, Paer, (, ), 8] (A) + (B) (C) + (D) + 8. Values of which satisfies the equation [IIT-JEE 00] tan ( + ) tan ( ) = sin (/) are : (A) ± (B) ± (C) ± (D) ± A-79 Indra Vihar, Kota Rajasthan 00 Page No. # 7
19 PART-II AIEEE (PREVIOUS YEARS PROBLEMS) æ.(a) tan + tan æ 9 is equal to : [AIEEE-00] () cos - æ () æ sin èø æ () tan.(b) cot ( ) cosa tan ( ) cosa =. then sin is equal to : () tan [AIEEE-00] æa () tan æa () cot è ø () tan a () cot æa. The trigonometric equation sin = sin a, has a solution for : [AIEEE-00] () < a < () all real values of a () a () a ³. If cos cos y = a, then y cos a + y is equal to : [AIEEE-00] () sin a () () sin a () sin a. æ If sin + æ cosec = then a value of is : [AIEEE-007] () () () (). æ The value of cot cos ec + tan is : [AIEEE-008] () 7 () 7 () 7 () If, y, z are in A.P. and tan, tan y and tan z are also in A.P., then : [JEE Mains_0] () = y = z () = y = 6z () 6 = y = z () 6 = y = z SUBJECTIVE QUESTIONS Write the rincial value of the following :.. cos æ - æ sin - è ø [ Marks] [ Marks]. tan (- ) [ Marks]. cos - è ø æ [ Marks] A-79 Indra Vihar, Kota Rajasthan 00 Page No. # 8
20 æ æ cos cos + sin sin sin sin æ cos cos 6 æ 7 [ Marks] [ Marks] [ Marks] 8. Evaluate : cot [tan a + cot a] [ Marks] 9. Find if sec ( ) + cos ec = [ Marks] Prove : sin = sin ( ) [ Marks]. Write the following in simlest form : æ + tan, ¹ 0 [ Marks] Prove that : sin + sin = tan [ Marks] 7 6. Prove that : tan + tan + tan + tan = [ Marks] 7 8 æ æ æ. Prove that : tan tan tan + = 7 7 [ Marks] æ 8 æ æ6. Prove that : sin sin cos 7 + = 8 [ Marks] sin sin 6. Prove that : cot æ æ =, Î 0, sin sin è ø [6 Marks] 7. Prove that : tan æ = - cos è ø [6 Marks] 8. Solve : tan + tan = / [6 Marks] 9. Solve : tan ( + ) + tan ( - ) = tan [6 Marks] 8 0. Solve : tan tan = - + [6 Marks]. Prove that : cos tan - æ æ,, = - Î - + sin [6 Marks] A-79 Indra Vihar, Kota Rajasthan 00 Page No. # 9
21 Eercise # PART - I A. (B) A-. (C) A-. (A) A-. (D) A-. (B) A-6.* (CD) B. (B) B-. (D) B-. (A) B-. (C) B-. (A) B-6. (C) B-7. (B) B-8. (B) B-9. (A) B0.* (BCD) B.* (ABC) B.* (AC) C. (B) C-. (D) C-. (B) C-. (A) C-. (D) C-6. (C) D. (C) D-. (B) D-. (C) D-. (D) D-. (A) D-6. (D) D-7.* (CD) D-8. (B) D-9. (B) D0.* (BD) D.* (AB) D.* (AD) PART - II. (C). (B). (D). (D). (C) 6. (D) 7. (A) (S), (B) (P), (C) (S), (D) (Q) 8. (A) (), (B) (q), (C) (), (D) (q) 9. (A) 0. (C) Eercise # PART - I. (B). (C). (B). (C). (D) 6.* (BC) 7. (C) 8. (B) 9. (C) 0. (C). (C). (B). (C). (A). (A) 6. (C) 7. (B) 8.* (AB) 9.* (AD) PART - II. (i) (ii) (iii) (iv) - (v) (vi) 7 6 (vii) (viii) (i) - () (i). êq -, ê ê - q, q < q ; ê ê - q, q -, q < q q -, ê ê ; ê q -, < q < < q ; ê ê q -, q -, q < < q < A-79 Indra Vihar, Kota Rajasthan 00 Page No. # 0
22 . (i) 8 + (ii) 7 70 (iii) (i) [-, 0) (ii) > (iii) (-, cot ) U (cot, ) 7. X = Y = -a 8. = ab 9. (i) Two solutions (, ) (, 7). ab + c (a - b) a + b. (i) (ii) (iii) ± (iv), 0, 7. (i) (ii) tan ( + n) - tan (iii) (iv) arc cot n + ê n Eercise # PART - I. (C). (B). (D). (D) 6. (A) (), (B) (q), (C) (), (D) (s) 7. (C) 8. (D) PART - II.(a) ().(b) (). (). (). (). () 6. () Eercise # tan ± A-79 Indra Vihar, Kota Rajasthan 00 Page No. #
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