$($Question $1)15$ points

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

A$.{\displaystyle \underset{\phantom{}}{\overset{\phantom{}}{}}}{t}^{2}co{s}^4(t^3)sin(t^3)dt$

B$.{\displaystyle \underset{\phantom{}}{\overset{\phantom{}}{}}}(k{e}^{2x}-\frac{1}{4}{e}^{\frac{1}{2}})dx$

C$.{\displaystyle \underset{0}{\overset{\frac{**}{4}}{}}}\frac{sin(\frac{t}{t})}{co{s}^2(\frac{t}{t})}d$