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

$\int\frac{25x-7}{12x^2-7x+1}dx$

$\left(x-y+z\right)\left(x+xy+z\right)$

$\left(x^2+3\right)^3\left(x-2\right)$

$\lim_{x\to4}z$

$\int\frac{3\cos\left(x\right)}{\sqrt{1+3\sin\left(x\right)}}dx$

$\log\left(m\right)^4=7$