Question

Express cos^2 x in terms of cos2x

Answer 1

cos (2x) = 1 - 2sin^2( x)

Answer 2

are you getting it

Answer 3

ah you there @jonathan283

Answer 4

The Cosine Double Angle Formula comes in several forms, I think we want to use this one:
\[\Large \color{royalblue}{\cos(2x)=2\cos^2x-1}\]
Solve for cos^2x.