Question

Verify cosx*sinx/1+cos2x = sinx

Answer 1

are you sure , the right side is sinx ?

Answer 2

Yes

Answer 3

well, this is what i get...

first, use the identity :
1 + cos2x = 2 cos^2 x
so, the left side becomes :

cosx*sinx/1+cos2x
cosx*sinx/(2cos^2 x)

then simplied again, get
sinx/2cosx
remember that sin/cos = tan, so
sinx/2cosx = (tanx)/2


in other words, it doesnt matching on the right side above