$\lim_{x\to1}\left(\frac{2}{x^2-1}-\frac{1}{\sin\left(x-1\right)}\right)$

$19\:+\:a\:=\:-50$

$\frac{\left(-3\right)\cdot\left(+8\right)+\left(-5\right)\cdot\left(+3\right)}{\left(-13\right)}$

$3\cdot5+\frac{400}{20}+\left(87-72\right)$

$\int\left(-45+w^{0.13}\right)dw$

$\sqrt[3]{27x^{3p}}y^{6q}z^{12r}$

$\frac{x^2+5x+8}{x+3}$