Question

Given that coto - - 2, sec 0 <0 for the angle 0,050<2n, find the exact value of (a) sin (29). (b) cos (20). (c) sin, and (d) cos

Answer 1

1 * Given that colo=-220 = DE II, II and seco co PoE LU and OE oc21 2 OETL cuadeant 90 Loe 180 ato = -2 C40 =-2 S2 Flon Pythagolas rules H²= s ps² #2 = 4f1=5 H=15 Sino = opposte side to o hypotentes Coso = adjacent side S hyptenhule i5 @ Sinag = 2 Sino ClO = 2(1) - COQ 20 1-2 Sino = 1- - -1- © we have coso = 1 / 1-2sino = / of it @ = 20min → SP2 2

- SDP = 2fvs शाद of Sinę = since 90 <0 (180 as 4sc o < 90' liee ñ quadrant. So sang = [248 - 2 + ③ we have coso = 3 2008) - De 2002 = - color = $5 - 2 25 coro CORÇ = G C D EI Quadset