Write $\left( \cos ^ { 2 } x \right) \left( 1 + \tan ^ { 2 } x \right)$

Short Answer

Write $\left( \cos ^ { 2 } x \right) \left( 1 + \tan ^ { 2 } x \right)$
in terms of $\sin x$
and $\cos x$
then simplify.