$\lim_{x\to40}\left(\csc\left(x\right)\right)$

$\lim_{x\to0}\left(\frac{\left(2\cdot n+1\right)sin\left(x\right)-sin\left(\left(2\cdot n+1\right)x\right)}{4sin^3\left(x\right)}\right)$

$\ln\left(x\right)-6=-4$

$-36-\left(64+18\right)$

$\int\:x\left(3x+1\right)^7\:\:dx$

$\frac{\frac{x-13}{\sqrt{x-4}+3}}{x-13}$

$\left(5x^3+8z\right)^2$