Question

cos^2(x)=1/2

Answer 1

noted

Answer 2

ok i guess you have to solve for \(x\)right?
start with
\[\cos(x)=\pm\frac{1}{\sqrt2}\]
or to make them more clear, maybe
\[\cos(x)=\frac{\sqrt2}{2}\] or
\[\cos(x)=-\frac{\sqrt2}{2}\]