$($Question $1)15$ points

Evaluate the indicated integrals if $a$ is a positive real number constant.

A$.{\displaystyle \underset{\frac{1}{4}}{\overset{3}{}}}(x-sinx)dx$

B$.{\displaystyle \underset{\phantom{}}{\overset{\phantom{}}{}}}(\frac{2}{x}{e}^{-2ax})dx$

C$.{\displaystyle \underset{0}{\overset{1}{}}}\frac{x}{\sqrt[\phantom{2}]{a{x}^2}}dx$