Question

Rewrite with only sin x and cos x.

sin 2x - cos x
OPTIONS ARE
2 sin x cos2x

sin x

cos x (2 sin x - 1)

2 sin x

Answer 1

hint: use the identity sin2x = 2 sinx cosx

Answer 2

how would i get the answer?

Answer 3

so its A ? @cwrw238

Answer 4

sin(x+x) = sinxcosx + cosxsinx = 2sinxcosx
then sin 2x - cos x = 2sinxcox - cosx
= cosx ( 2sinx - 1)