Derive the following:
y = (cosxsin2x)-2
2. The attempt at a solution
Basically I saw this as a power rule with two products in the middle.
So y = -2 (cos2cos2x-sinxsin2x)-1
But the correct answer is completely different, it's:
4(3sin2x - 1) all over
Could someone please go through the steps to get to the correct solution? Thanks in advance!