Question

Simplificar cos2x (1+tan2x)

Answer 1

\cos \left(2x\right)\left(1+\tan \left(2x\right)\right)=\cos \left(2x\right)\cdot \:1+\cos \left(2x\right)\cdot \tan \left(2x\right)=\cos \left(2x\right)+\cos \left(2x\right)\tan \left(2x\right)