QUESTION $3$

${\displaystyle \underset{\phantom{}}{\overset{\phantom{}}{}}}\frac{2d}{2+cos}$

A$.2tanx+2secx+C$

B$.\frac{4}{\sqrt[\phantom{2}]{3}}ta{n}^{-1}(\frac{x}{2})+C$

C$.\frac{4}{\sqrt[\phantom{2}]{3}}ta{n}^{-1}(\frac{x}{\sqrt[\phantom{2}]{3}})+c$

D$.\frac{4}{\sqrt[\phantom{2}]{3}}ta{n}^{-1}[\frac{1}{\sqrt[\phantom{2}]{3}}tan(\frac{x}{2})]+C$

E$.2se{c}^{-1}(\frac{x}{2})+C$