$1\:x\:2+2$

$\left|-2\:\:\:\:\:1\right|\:\cdot\left|5\:\:2\:\:\right|\:\cdot\:21$

$\left(\frac{4xy}{y^3}\right)^{-3}$

$\sin\left(x\right)+\csc\left(x\right)=2\csc\left(x\right)-\cos\left(x\right)\cot\left(x\right)$

$\left(\frac{3}{5}+z\right)^2$

$\lim_{x\to-7}\left(\frac{5-\sqrt{4-3x}}{\sqrt{x+8}}\right)$

$\left(3x-7\right)\left(2x-13\right)$