$\left|-7+\frac{3}{4}\right|$

$186-u\ge191$

$\left(3-zx\right)^2$

$\sin\left(2x\right)\sin\left(x\right)=\cos\left(2x\right)\cos\left(x\right)$

$\left(2+r\right)\left(8+r\right)$

$\int\frac{x+4}{x\left(x+3\right)^2}dx$

$\frac{d}{dx}\left(ctg\left(e^x+lnx\right)\right)$