$\cos\left(x\right)\left(2\cos\left(x\right)+1\right)$

$\frac{\sin\left(x\right)}{\sin\left(90-x\right)}+\tan\left(x\right)\csc\left(x\right)$

$2\ln\left(x-4\right)=\ln\left(x+6\right)+\ln\left(5\right)$

$m^2+n^2-3mn+4n^2-5m^2-5n^2$

$6\:x\:10^4$

$\int\frac{x+8}{x^2\cdot\left(x-1\right)^2\cdot\left(x+1\right)^2}dx$

$-2+4+9$