By the end of this set of exercises, you should be able to. recognise the graphs of sine, cosine and tangent functions
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1 FURTHER TRIGONOMETRY B the end of this set of eercises, ou should be able to (a) recognise the graphs of sine, cosine and tangent functions sketch and identif other trigonometric functions solve simple trigonometric equations (in degrees) define the period of trigonometric functions, either from their graphs or from their equations (e) simplif trigonometric epressions using sin + cos = 1 sin and tan = cos Mathematics Support Materials: Mathematics 3 (Int ) Ð Student Materials 5
2 A. Sine, cosine and tangent graphs Eercise 1 You ma have drawn the sine, cosine and tangent graphs as part of the introduction to trigonometr in Maths Intermediate. If ou have retained the graphs, ou ma miss out questions 1 to 3 of Eercise 1 below. 1. The Sine Graph (a) Make a cop of this table and use our calculator to help fill it in, giving each answer correct to decimal places sin 0á00 0á34 0á64 0á87 0á98 1á sin Use a piece of mm graph paper to draw a set of aes as illustrated below Ð1 Plot as accuratel as possible the 1 points from our table. Join them up smoothl to create the graph of the function = sin.. Repeat question 1 (a) to for the function = cos 3. Repeat for the graph of = tan (a different scale will be required for the vertical ais). 4. Stud our three graphs carefull. You should now be able to sketch the sine, cosine (and tangent) graphs fairl quickl (about 30 seconds) indicating the main points where the graphs cut the and aes and the general shape of each graph. Tr them now. Mathematics Support Materials: Mathematics 3 (Int ) Ð Student Materials 6
3 Sketches of the three trigonometric graphs, for comparison: 1 = sin = tan Ð1 1 = cos Ð1 Check our graphs are similar to those shown above. B. Sketching and identifing trigonometric functions Eercise A 1. Write down the equations of the trigonometric functions represented b the following graphs: (a) Ð10 Ð6 5 0á Ð5 Ð0á8 Mathematics Support Materials: Mathematics 3 (Int ) Ð Student Materials 7
4 (e) 0 (f) Ð0 Ð80 (g) 5 (h) Ð5 Ð4 (i) 50 (j) Ð (k) 0á (l) Ð0á Ð15. Make neat sketches of the following trigonometric functions, clearl indicating (i) the shape of the graph (draw one ÔccleÕ of it onl) (ii) the important values on the horizontal ais (iii) the maimum and minimum values of the function. contõd... Mathematics Support Materials: Mathematics 3 (Int ) Ð Student Materials 8
5 (a) = 3sin = 4cos = tan 3 = 10sin 3 (e) = 1cos (f) = 0á7sin 4 (g) = 1ácos 4 (h) = 30sin 6 (i) = 100cos 5 (j) = Ðsin (k) = Ð6sin 1 / (l) = Ð0cos 3 3. Make neat sketches of the following over the given range of values: (a) = 60sin = á5cos = 40sin = Ðcos (e) = Ð15sin (f) = 1á8cos Eercise B 1. Write down the equations of the trigonometric functions in the form = k sin( Ð a) or = k cos( Ð a) represented b the following graphs: (a) 5 8 Ð Ð Ð5 Ð8 5 0á Ð5 Ð0á6 (e) 4 (f) Ð Ð4 Ð15. Make neat sketches of the following trigonometric functions, showing clearl: (i) where each graph cuts the - ais. (ii) the maimum and minimum values. (a) = 10sin( Ð 15) = 1á4 cos( Ð 0) = 15sin( + 10) = á4 cos( + 30) (e) = 300sin( Ð 80) (f) = tan( Ð 10) Mathematics Support Materials: Mathematics 3 (Int ) Ð Student Materials 9
6 C. Solving trigonometric equations Eercise 3 S (in) T (an) A (ll) C (os) 1. Find the two solutions for each of the following in the range 0 360: (Give each answer correct to the nearest whole degree). (a) sin = 0á500 cos = 0á707 tan = 0á869 cos = 0á940 (e) tan = 1á80 (f) sin = 0á574 (g) sin = 0á990 (h) tan = 6á314 (i) cos = 0á391 (j) cos = 0á985 (k) sin = 0á866 (l) tan = 1á73. Rearrange each of the following and solve them in the range (Give our answers correct to 1 decimal place). (a) cos Ð 1 = 0 5sin Ð 4 = 0 10tan Ð 7 = 0 1 Ð 3sin = 0 (e) 5 Ð 6cos = 0 (f) 3tan Ð 5 = 0 3. Find the two solutions for each of the following in the range 0 360: (Give each answer correct to the nearest whole degree). (a) sin = Ð0á500 cos = Ð0á707 tan = Ð0á384 cos = Ð0á9 (e) tan = Ð1á000 (f) sin = Ð0á866 (g) tan = Ð 4 (h) sin = Ð0á174 (i) cos = Ð0á97 4. Rearrange each of the following and solve them in the range (Give our answers correct to 1 decimal place). (a) 4sin + 1 = 0 5cos + 3 = 0 3tan + 1 = cos = 0 (e) 0á4sin + 0á3 = 0 (f) 5tan + 8 = 0 5. Solve the following miture of trigonometric equations in the range (Give our answers correct to 1 decimal place). (a) sin = 0á33 cos = Ð0á9 tan = 0á678 cos = 1 / 4 (e) sin = Ð0á707 (f) tan = Ð (g) sin = 3 / 5 (h) cos = Ð0á111 (i) tan = 5 / 8 (j) 8sin + 5 = 0 (k) 6cos + 3 = 0 (l) 1 Ð 5tan = 0 (m) 0sin Ð 17 = 0 (n) 15 Ð 5cos = 0 (o) 8tan + 7 = 0 (p) 5sin + 3 = sin + 5 (q) 7cos Ð 1 = cos + 4 (r) 10tan + 8 = 3tan + 4 (s) 6sin + 11 = 3sin + 10 Mathematics Support Materials: Mathematics 3 (Int ) Ð Student Materials 30
7 D. The period of a trigonometric function Eercise 4 1. Determine the period and the maimum and minimum values of these trig functions. (a) Ð7 Ð8 0á Ð0á5 Ð5 (e) 9 (f) Ð9 30 Ð6 (g) 0á1 180 Ð0á1. Determine the period and the maimum and minimum values of these trig functions. (a) = 5sin = 3cos3 = 10tan4 = ácos (e) = 30sin 6 (f) = Ð5cos30 (g) = 50sin 90 (h) = Ð 4cos 1 / (i) = 18sin 1 / 4 (j) = 0á9cos 60 (k) = 1 / sin 5 (l) = 3 / 4 cos 9 (m) = 11sin 180 (n) = 8sin 1á5 (o) = 40cos á5 Mathematics Support Materials: Mathematics 3 (Int ) Ð Student Materials 31
8 E. Trigonometric identities Eercise 5 sin Remember :- sin + cos = 1; and tan = cos 1. Simplif the following using the above identities: (a) sin + cos 5cos + 5sin 3sin 5sin cos cos. Write down a simple epression, identical to: sin (a) 1 - sin 1 - cos tan cos cos 3. Simplif: (a) 1 - cos 1 - sin sin sin cos cos 1 - sin 1 - cos (e) (f) tan ( 1 - sin ) cos 5sin 4. Prove the following trigonometric identities: (a) 3-3sin = 3cos 5-5cos = 5sin 1 - cos = sin tan 1 - sin = sin 1 - cos (e) 1 - sin = tan 1 - sin 1 (f) 1 - cos = tan Mathematics Support Materials: Mathematics 3 (Int ) Ð Student Materials 3
9 Checkup for further trigonometr 1. Make a sketch of the sine, cosine and tangent graphs, indicating all their main features.. Write down the equations of the trigonometric functions associated with the following graphs: (a) 8 0á Ð8 Ð0á7 á Ðá Make neat sketches of the following, indicating all the main points and features: (a) = 0sin = 1á6cos = Ð8sin = tan Find the two solutions for each of the following in the range 0 360: (Give our answers correct to 1 decimal place). (a) sin = 0á911 cos = 0á444 tan = 3 cos = Ð0á605 (e) tan = Ð0á8 (f) sin = Ð 4 / 5 (g) sin Ð1 = 0 (h) 8cos + 6 = 0 (i) 4tan Ð 3 = 0 (j) 3cos Ð = 0 (k) 1 + 4sin = 0 (l) 5tan = 3tan Ð Mathematics Support Materials: Mathematics 3 (Int ) Ð Student Materials 33
10 5. What are the periods of the following trigonometric graphs and functions? (a) Ð6 Ð Ð (e) = 10sin 10 (f) = á3cos 30 (g) = Ð 4sin 9 (h) = 5tan 4 6. (a) Simplif: (i) 6-6sin (ii) cos sin Prove these identities :- (i) 1 - cos = 1 sin (ii) ( 1- sin )( 1+ sin )= cos 7. Write down the equations of the following trigonometric graphs: (a) 8 3á6 Ð Ð8 Ð3á6 8. Sketch the following trigonometric graphs, indicating their main features: (a) = 18cos( + 30) = sin( Ð 10) Mathematics Support Materials: Mathematics 3 (Int ) Ð Student Materials 34
11 Further trigonometr Eercise 1 1. Check Graphs Ð see graphs at top of page 15 for comparison. Eercise A 1. (a) = 10sin = 6cos = 5sin = 0á8cos 4 (e) = 0sin (f) = 80cos (g) = 5sin 1 / (h) = Ð4sin (i) = Ð50cos 3 (j) = tan (k) = 0ácos 1 / (l) = 15sin 4. (a) 3 4 Ð3 360 Ð (e) (f) á7 Ð10 10 Ð Ð0á7 (g) (h) (i) 1á Ð1á Ð30 Ð100 (j) (k) (l) Ð1 Ð6 Ð0 Mathematics Support Materials: Mathematics 3 (Int ) Ð Student Materials 46
12 3. (a) 60 á Ð60 Ðá5 Ð40 (e) (f) 15 1á8 Ð 180 Ð Ð1á8 6 1 Eercise B 1. (a) = 5sin( + 30) = 8cos( + 0) = 5sin( Ð 10) = 0á6sin( Ð 40) (e) = 4cos( Ð 35) (f) = 15sin( + 70) or = 15cos( Ð 0). (a) 10 1á4 Ð Ð1á á4 Ð Ðá Ð15 (e) 300 Ð300 (f) Mathematics Support Materials: Mathematics 3 (Int ) Ð Student Materials 47
13 Eercise 3 1. (a) 30, , , 1 0, 340 (e) 5, 3 (f) 35, 145 (g) 8, 98 (h) 81, 61 (i) 67, 93 (j) 10, 350 (k) 60, 10 (l) 60, 40.. (a) 60, á1 or 16á9 35á0, 15á0 19á5, 160á5 (e) 33á6, 36á4 (f) 59á0, 39á0. 3. (a) 10, , 5 159, , 53 (e) 135, 315 (f) 40, 300 (g) 104, 84 (h) 190, 350 (i) 158, (a) 194á5, 345á5 16á9, 33á1 161á6, 341á6 151á0, 09á0 (e) 8á6, 311á4 (f) 1á0, 30á0. 5. (a) 18á8, 161á 154á, 05á8 34á1, 14á1 75á5, 84á5 (e) 5, 315 (f) 116á6, 96á6 (g) 36á9, 143á1 (h) 96á4, 63á6 (i) 3á0, 1á0 (j) 18á7, 31á3 (k) 10, 40 (l) 11á3, 191á3 (m) 58á, 11á8 (n) 53á1, 306á9 (o) 138á8, 318á8 (p) 41á8, 138á (q) 33á6, 36á4 (r) 150á3, 330á3 (s) 199á5, 340á5. Eercise 4 1. Graph (a) (e) (f) (g) Period Ma/Min ±7 ±8 ±0á5 ±5 ±9 ±6 ±0á1. Question (a) (e) (f) (g) (h) Period Ma/Min ±5 ±3 ±10 ±á ±30 ±5 ±50 ±4 Question (i) (j) (k) (l) (m) (n) (o) Period Ma/Min ±18 ±0á9 ±0á5 ±0á75 ±11 ±8 ±40 Mathematics Support Materials: Mathematics 3 (Int ) Ð Student Materials 48
14 Eercise 5 1. (a) 5 3tan 5 / tan. (a) cos sin sin tan 3. (a) 1 1 / tan cos (e) 1 / 5 sin (f) sin 4. All proofs. Checkup for further trigonometr 1. See sketches on page 15.. (a) = 8sin = 0á7cos4 =Ðá7sin3 = tan3 3. (a) á6 Ð0 Ð1á6 360 Ð Ð8 4. (a) 65á6, 114á4 63á6, 96á4 71á6, 51á6 17á, 3á8 (e) 141á3, 31á3 (f) 33á1, 306á9 (g) 30, 150 (h) 138á6, 1á4 (i) 36á9, 16á9 (j) 48á, 311á8 (k) 194á5, 345á5 (l) 135, (a) (e) 36 (f) 1 (g) 40 (h) (a) (i) 6cos (ii) 1 tan Proof. 7. (a) = 8sin( + 15) = 3á6cos( Ð 0) 8. (a) 18 Ð Ð 370 Ð18 Mathematics Support Materials: Mathematics 3 (Int ) Ð Student Materials 49
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