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1 5 TRtGOhiOAMTRiC WNCTIONS D O E T F F R F l I F U A R N G TO N I l O R C G T N I T Triangle ABC bas a right angle (9Oo) at C and sides of length u, b, c. The trigonometric functions of angle A are defined as follows. 5 sintz. of A = sin A 1 = : = 5 cosine. of A = ~OS A 2 = i = opposite hypotenuse adjacent hypotenuse B opposite 5 tangent. of A = tana 3 = f = -~ adjacent adjacent 5 c. of A = ocet A 4 = k = t c z n g opposite A 5.5 hypotenuse secant of A = sec A = t = -~ adjacent 5 cosecant. of A = csc A 6 = z = hypotenuse opposite Fig. 5-1 E TX A WO T N M 3 H GE G A TE I RN 9 L Y H C ES0 E A H AI Consider an rg coordinate system [see Fig. 5-2 and 5-3 belowl. A point P in the ry plane has coordinates (%,y) where x is eonsidered as positive along OX and negative along OX while y is positive along OY and negative along OY. The distance from origin 0 to point P is positive and denoted by r = dm. The angle A described cozmtwczockwlse from OX is considered pos&ve. If it is described dockhse from OX it is considered negathe. We cal1 X OX and Y OY the x and y axis respectively. The various quadrants are denoted by 1, II, III and IV called the first, second, third and fourth quadrants respectively. In Fig. 5-2, for example, angle A is in the second quadrant while in Fig. 5-3 angle A is in the third quadrant. Y Y II 1 II 1 III IV III IV Y Y Fig. 5-2 Fig f

2 12 TRIGONOMETRIC FUNCTIONS For an angle A in any quadrant the trigonometric functions of A are defined as follows. 5.7 sin A = ylr 5.8 COS A = xl?. 5.9 tan A = ylx 5.10 cet A = xly 5.11 sec A = v-lx 5.12 csc A = riy RELAT!ONSHiP BETWEEN DEGREES AN0 RAnIANS A radian is that angle e subtended at tenter 0 of a eircle by an arc MN equal to the radius r. Since 2~ radians = 360 we have radian = 180 /~ = o = ~/180 radians = radians B N 1 r e M 0 r Fig. 5-4 REkATlONSHlPS AMONG TRtGONOMETRK FUNCTItB4S 5.15 tana = sine A + ~OS~A = COS A &A ~II ~ zz - tan A sin A 1 sec A = ~ COS A 1 csca = - sin A 5.20 sec2a - tane A = csce A - cots A = 1 SIaNS AND VARIATIONS OF FUNCTIONS to 1 1 to 0 0 to m CC to 0 1 to uz m to II to 0 0 to -1 -mtoo oto-m -cc to -1 1 to ca III IV to -1-1 to 0 0 to d Cc to 0-1to-m --CO to to 0 0 to 1 -- too oto-m uz to 1-1 to --

3 TRIGONOMETRIC FUNCTIONS 1 3 E V X F AT A O RL FC R IU OUT V GE F NA A OS CN R N TG I Angle A Angle A in degrees in radians sin A COS A tan A cet A sec A csc A w 1 cc 15O riil2 #-fi) &(&+fi) 2-fi 2+* fi-fi &+fi 300 ii/6 1 +ti *fi fi \$fi zl4 J-fi \$fi 1 1 fi fi 60 VI3 Jti r 1 fi.+fi 2 ;G 750 5~112 2+& 2-& &+fi fi-fi 900 z *CU 0 km 1 105O 7~112 *(fi+&) -&(&-Y% -(2+fi) -(2-&) -(&+fi) fi-fi 120 2~13 *fi -* -fi -\$fi fi -*fi fi \h 150 5~ ti -*fi -fi -+fi 2 165O llrll2 \$(fi- fi) -&(G+ fi) -(2-fi) -(2+fi) -(fi-fi) Vz+V-c? 180?r Tm -1 *ca ~112 -\$(fi-fi) -*(&+fi) 2-fi 2 + ti -(&-fi) -(&+fi) & 6 l f 3 i - g -2 f i 225O 5z-14 -Jfi -*fi 1 1 -fi -fi 240 4%J3 -# -4 ti &fi O 17~112 -&&+&Q -&(&-fi) 2+fi 2-6 -(&+?cz) -(fi-fi) km 0 Tm O 19?rll2 -&(&+fi) *(&-fi) -(2+6) &+fi -(fi-fi) ïrl3 -*fi 2 -ti -*fi 2 -\$fi 315O 7?rl4-4fi *fi -1-1 fi -fi rl6 1 *fi -+ti -ti \$fi O i(fi- 6) &(&+ fi) -(2 - fi) -(2+6) fi-fi -(&+fi) 360 2r T-J 1?m For tables involving other angles see pages and f

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9 TRIGONOMETRIC FUNCTIONS y = cet-1% 5.90 y = sec-l% 5.91 y = csc-lx _--/ I T Y / /A , /, // -- Fig Fig Fig RElAilONSHfPS BETWEEN SIDES AND ANGtGS OY A PkAtM TRlAF4GlG The following results hold for any plane triangle ABC with sides a, b, c and angles A, B, C. A 5.92 Law of Sines 5.93 Law of Cosines with -=Y=a b c sin A sin B sin C cs = a2 + bz - Zab COS C similar relations involving the other sides and angles. C /A 1 f 5.94 Law of Tangents with a+b tan \$(A + B) - a-b = tan i(a -B) similar relations involving the other sides and angles. Fig sina = :ds(s - a)(s - b)(s - c) where s = &a + b + c) is the semiperimeter of the triangle. Similar relations involving B and C cari be obtained. See also formulas 4.5, page 5; 4.15 and 4.16, page 6. angles Spherieal triangle ABC is on the surface of a sphere as shown in Fig Sides a, b, c [which are arcs of great circles] are measured by their angles subtended at tenter 0 of the sphere. A, B, C are the angles opposite sides a, b, c respectively. Then the following results hold Law of Sines -z-x_ sin a sin b sin c sin A sin B sin C 5.97 Law of Cosines cosa = cosbcosc + sinbsinccosa COSA = - COSB COSC + sinb sinccosa with similar results involving other sides and angles.

10 2 0 T R F I U G N O C N T O 5 L o. T a 9f a w 8 n g e n t s t & + B a t( \$ ) + n b aa ( ) n u t & - B a= t( ) n A a n i ( w s r i i i et o mn s sh a t aiv i un h nl o d l d e ag l e t r r l v s s e i w s = & h 1 + c S( e r ) u i h r f e. o m+ ose o sa t a i li r un h n l d ld e ga e t r l r s w S = + h + B + C ( Se r) A i rh f e. o me os o sa t a i li r un h nl d ld e ga e t r lr S a f e 4 l op 1e. s ra 0 4o mg. 4 e u, l a NAPIER S RlJlES FGR RtGHT ANGLED SPHERICAL TRIANGLES E f r x a o C it c na r f, ghp e gor si hae pt le f pv At r t rwe he i Zae t ih ei f t r3s o ai nr h rc r nc a g i F s i wn i b -va b i c g B e le,, u,.. 9 n A l, d a C O F 5 i - g 1. 9 F 5 i - g 2. S t uq h a pua e ri p a r c s ae n ionrfi 5e s n wsta ir w- a e hi ng ct e 2p t etcg. lh 0r t ri Oeee [ c i ot hn mo c ayd a p A anpi B n l nd oc g. c d ta ml et ee ni n s A o o t n p n of th y ac e f i hce ri a ms ia prt ti ts l ancs hd wl pvle e ad eo c a-e i rl da frg a p da t at rj n h wr p ea d a e c to a omc r a ps rp eate lan pt xi hr r l aaos t n eut e psr i nsl di ie 5 T s. o a h m i1 f p n e i n0 t a py q d e o1 ht r rt u d f oe h t oa aa l f e ph dn dl e ae ug js r ce a T s o a h m i f p n e i n t a py q d e o ht r rc u d f o e ht t o a l f pe h dsp l e ae uip s r nco E S x C = 9i a- O C n0 = m9a - O wc h0 p, B A - e e a l, B ve e : s a = t b it ( a n a Co n s n = r Ot i -a n B n a ) b s ( = Ci Ca C ( n O OoO C ~ A S = -r S C Oa Os B A O - S i ) S B n T c o ch ba o f o e a e r fb uts rl i rt 5 rhe o es p oa 1. se n o s a m i 9 e u g n. 7 l e e

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