Question

write Cos^2(x/2) - Sin(2x) in terms of Sin(x) and Cos(X) . ((hint use a double angle and half angle identity ))

Answer 1

Then add them.

Answer 2

i don't know how to do that
can u show me?

Answer 3

dat's the answer

Answer 4

\[\frac{ 1+cosx }{ 2 }-2sinxcosx=\frac{ 1+cosx-4sinxcosx}{2}=\frac{ 1+cosx(1-4sinx)}{2}\]