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:: :

sin 2A::: 2 sin A

Doub;'e Angl,

addition formula,

show that sin 15 sir

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@ ex 13\ Is ( f 50 ( -: . P (x)J ?t.

9lV\ x-. t o 0" f tOS' A.. 9l\'\ ~ 0 s: l-ws lt.. + 1{;8i x , ;: M ~ n . . . (2 -.~ A 9 ~ 7LJ.a

/t, I ( lv"f ~ - v t J l a ~ - I . .3> .rX = {ttv\ -{ In)

= ~ {

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X 1).1&- r ; ~ ) 3 y , ?L = 2 (;Dr (Q{. flf) l) )

:? Invi ;>t =. {un>1 W J '15' - ;hv> J! S1:-' Y:;"J3 ~ 1 [ L c JL - ? f J ~ J

[ (] t S-i)"'';')t = f:. zc S >z. J(5 +S 2 ) ~ V l Jt :;. J2

,+a 1t1)t:: n..:5fJ2.

=: ti- '161;?L 7: ) [%"of 0(

:: (f.+GCf J ( ~ : : r . = r & :: l ' : i ' ~ ~ ( { J t ) ) ( 9 : : r ; . ~ o C { A r )

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r& ex (3, 1&s- c) '2 +aV1 x -t ]. , ~ V ) (?( _ ~ ~ ) C)::. ()

( 2+ttVl (l-t -nti'l ~ t ? (+tlVl:>t - \ ) z: 01-t tI. n Jt. 1" 2- ftt VIL / l + sftt VI J( 3 =- 02-fC1 VI'!. -f ') ~ V n. - z: 0

( ) - , f a ~ x.- - ( ) (feH")( +3 ) t: 0Cv ~ l / I J ( + :;.., 0

.-hi lit x, -.s)L ti I ( ~ ' t w wd Qv..cv(.

0( =- 1(h,-,6)o{ ~ t Vl - I ( ~ = 1/. 5 b S ~-:; 2b ,SbS", t f ._Q( ?b -0('j) t : . o() ! i -

= )tJ '5>bS" j 7-v b I ~ : - ( ( : ) I 3 ( ) 2 I 'flS-CI 2 ~ l b ) 'bob.'," (ltlf ) - (o[s,yo / 2 r , . ' f ~

, \Jx -:. ) ~ \ , ) IOfrY"; ) - o ~ ' b < ' ! J 2 ~ ' .. 'f/ (A - v l , ~ )

8/6/2019 AM Trigo Ex 13.1 Q5

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e tY 11"J s c1) :;2 kc (?l +bOo ) ~ S SGc. (. - ) o ~ )

.2- c;tos ()t -+&0') t ( ) ~ (x -2{)t. { t ~ " : I Q ' + f ~ " , i (,0' ) ~ : , . k.. J'- GOi "

0< = (O' it flT )CUA - I. 1- lor;51 t;

JL c, {go f r:J..Jz 1-o)s1 (S t \ 6s s t).: i ' l C Ir:L {o (fAr) IJ

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C',)< IJ, I&i ) ~ ) 4-et Lt) S JL fCH'1/1YL

'-f-ct Vl ) >L f ,-k V1 ~ ' 1 ' L [ - -1-ah "h- ft:t"tlx

,+a V) h t ~ ( ; ' \ S">1- =. fa It) 2x. (f- fah 27'\. fa 1/\ ~ J < . . . . )

(,;y31t--- I i a1{ .&.uk4 ,ft l l l l 2) n .= - I-h-ll-b1 6 C j C ~ . '

' ~ / I \ hL I ' IJ. f \ d . . t . . h ~ c fo( -:.. ta ll - l 0:= 0

3)(, eX J ltD - 0( J (to,+ o; J i b ~ , J g ( ' 6 ~ 1 - -r- J. ~ 6 +0( 5bO t ISv-o( 5bD t 1&1;-fcA. .. 3bo+ ~ 0- 0( (21AcL U1clt-)I I ) , . d'1wt fA :{)'O f (fu ) -1);-0 f l -f eX. J '7XJ 'f b() C' f n - ~ { ':J t1.t) o(

-= . 0) fw ) 360 J StFD J '72-0 J q00 I (O 9sv/L = 0) ()