Topics: Sections $7\mathrm{.}5,7\mathrm{.}8,$ Appendix $E$ and $11\mathrm{.}1in$ the textbook.

Problem #$1$: Evaluate the following integral.

${\displaystyle \underset{0}{\overset{\frac{}{2}}{}}}xcos9xdx$

Problem #$1$:

Enter your answer symbolically,

$asin$ these examples