$\frac{\frac{\cos\left(x\right)}{\sin\left(x\right)}}{\sin\left(x\right)}$

$-8+\left|5-\left(-16\right)\right|$

$\log_b\left(x+2\right)+\log_b\left(x\right)=\log_b\left(25\right)$

$\frac{d}{dx}\:ax^2+2cxy+by^2=1$

$\frac{dy}{dx}\left(t^2e^y\right)$

$32x^4-4x$

$xy+y=\left(xy\right)^3$