$\int_2^{\infty}\left(\frac{1}{x\ln^8\left(x\right)}\right)dx$

$b-3b+6b-2b$

$\int x\cos nydx$

$csc\left(\frac{\pi\:}{2}-u\right)=secu$

$\left(x-y+3z\right)+\left(5x-7y+8z\right)+\left(\left(-6x-9y+5z\right)\right)$

$\int\frac{10x^2}{\sqrt{4-x^2}}d\theta\:$

$\lim_{x\to\infty}\left(\frac{2x}{\sin\left(3x\right)}\right)$