$\lim_{x\to2}\left(\frac{2x^2}{x-2}-\frac{5}{\ln\left(x-1\right)}\right)$

$cos\left(x\right)\cdot tan\left(x\right)=\:tsen\:\left(x\right)$

$\int\left(\frac{x-1}{\left(x+2\right)^2\left(x-3\right)}\right)dx$

$\frac{30a^{11}b^9}{10a^2b^4}$

$\frac{\left(2x^4\right)^2}{\left(5y^2\right)^3}$

$\left(12\right)\left(-6\right)\left(-2\right)\left(-3\right)$

$16x^2-64=0$