Question

IF Sin theta + cos theta =1÷
2(cos theta-sin theta)
o°< theta< 90° then sin theta=
a) 0
b) 1
c) 1/2
d) 1/4​

Answer 1

Step-by-step explanation:

sinx+cosx=1/2(cosx-sinx)

cos²x-sin²x=½.

cos2x=1/2 that is cos2x not cos²x

x=30

sin30=1/2