Question

I wanna know, Is this equal?

Answer 1

\[\Huge \cos^2(2x)=\frac{ 1+\cos(4x) }{ 2 }\]

Answer 2

Any help?

Answer 3

Oh sorry :)

\[\Huge\rm \cos^2(\color{orangered}{angle})=\frac{ 1+\cos(2\cdot\color{orangered}{angle}) }{ 2 }\]Your Half Angle Identity tells you this, right?

Answer 4

\[\Huge\rm \cos^2(\color{orangered}{2x})=\frac{ 1+\cos(2\cdot\color{orangered}{2x}) }{ 2 }\]So ya, everything looks good :)

Answer 5

Tank yew bery much! I just wanted to make sure.