Question $1$

Evaluate ${\displaystyle \underset{\phantom{}}{\overset{\phantom{}}{}}}se{c}^3()ta{n}^5()d$

$\frac{1}{7}se{c}^7()-\frac{1}{5}se{c}^5()+C$

$\frac{1}{7}se{c}^7()-\frac{1}{3}se{c}^3()+C$

$\frac{1}{3}se{c}^3()-\frac{1}{5}se{c}^5()+C$

$\frac{1}{7}se{c}^7()-\frac{2}{5}se{c}^5()+\frac{1}{3}se{c}^3()+C$

$\frac{1}{5}se{c}^5()-\frac{1}{3}se{c}^3()+C$