Question

:D

Answer 1

\(\LARGE\color{blue}{ \bf (cos^{2}θ)(1+tan^{2}θ) }\)

\(\LARGE\color{blue}{ \bf (cos^{2}θ)(1+\frac{sin^{2}θ}{cos^{2}θ}) }\) expand the identity, and then use the rule

\(\LARGE\color{blue}{ \bf sin^2x+cos^2x=1 }\)