$\left(-3\right)+\left(-9\right)-\left(-4+11+6\right)$

$\frac{4x+16}{4x}$

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

$\left(3t^2e\:-2\right)\left(4t-3e\right)$

$\int\frac{x^8}{\sqrt{x^9-4}}dx$

$100v^2-220+121$

$tan^2a\:+cot^2a\:+2\:=\:sec^2\csc\left(a\right)^2$