$\int_{x^{8}}^{8}dx$

$\left(x+22\right)\left(x-15\right)=98$

$xycot\left(xy\right)=ysen\left(x\right)+ysen\left(\frac{1}{y}\right)$

$\int\frac{x^2+12x+12}{x-4}dx$

$18\:+\:8\:+2$

$-4\left(8k-5\right)$

$\frac{\cos\:2\left(x\right)}{1-\sin\:2\left(x\right)}=\frac{\cos\:\left(x\right)+\sin\:\left(x\right)}{\cos\:\left(x\right)-\sin\:\left(x\right)}$