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

question 93

Short Answer

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