$\sin\left(a\right)+\cot\left(a\right)\cos\left(a\right)-\csc\left(a\right)$

$\frac{x^3+6x+2}{x+3}$

$-a-b+2b-2c+3a+2c-3b$

$cos\left(x+\frac{\pi}{4}\right)=\frac{1}{\sqrt{2}}$

$\int48csc\left(8x\right)cot\left(8x\right)dx$

$\left(9a+\frac{1}{6}\right)^2$

$\lim_{x\to\infty}\left(\sqrt{n}\left(\sqrt{n+1}-\sqrt{n}\right)\right)$