Question $4$

Evaluate the indefinite integral of each function below:

$($a$){\displaystyle \underset{\phantom{}}{\overset{\phantom{}}{}}}(cosx+e^{co{s}^{2}x}sin2x)dx$

$[5]$

$($b$){\displaystyle \underset{\phantom{}}{\overset{\phantom{}}{}}}\frac{cosx}{2+5sinx}dx$

$[5]$

$($c$){\displaystyle \underset{\phantom{}}{\overset{\phantom{}}{}}}\frac{dx}{1-sinx}$

$[5]$