Question

verify the identity cos^2 2x=1-4cos^2x sin^2x

any help would be greatly appreciated ive been on this question for over 30 minutes i've tried using cos2theta double angle formulas but im having difficulty

Answer 1

from the right handside
\[1-4cos^2(x)sin^2(x) = 1-(2cos(x)sin(x))^2\\=1-sin(2x)^2 = cos^2(2x)\]
Dat sit

Answer 2

Yes or No?

Answer 3

Thank you so much!