$\int xcos\frac{x}{8}dx$

$3+\frac{1}{x}=\frac{10}{x^2}$

$6x\left(a+2\right)+3y\left(a+2\right)$

$-15^2$

$\frac{d^2}{dx^2}x\sqrt{4-x^2}$

$\frac{1}{\sin^2\left(x\right)}+\frac{\sec^2\left(x\right)}{\tan^2\left(x\right)}=2\csc^2\left(x\right)$

$\left(3a^5\:+\:7b^3\right)^2$