$\frac{d}{dx}\left(ln\left(x+4\right)\right)^2$

$7x-15\le13$

$\frac{1}{\sin\left(x\right)+\cot\left(x\right)\cos\left(x\right)}=\sin\left(x\right)$

$\left(x-16\right)\left(y+2\right)=\left(x-14\right)\left(y+1\right)$

$\frac{d^5}{dx^5}\left(e^{-3x}\right)$

$\frac{1-\left|x-x^2\right|}{\sqrt{x^4+\left|x\right|}}$

$4a^2\:-\:2b^2$