Question

Please help, cos2x + cos3x sinx = 1/2

Answer 1

cos^2x = 1-sin^2x.

So, substitute and see what you get.

Answer 2

\[\cos ^{2}x+\cos ^{3}xsinx=\frac{1}{2}\]

Answer 3

Is that the equation?

Answer 4

Or is it
\[\cos2x+\cos3xsinx=\frac{1}{2}\]

Answer 5

Your version may be the right one as I can't see how the "former one" I interpreted could hold true.