$\int\frac{2}{x^2\sqrt{3-x^2}}dx$

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

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

$\frac{1}{sin\left(x\right)\cdot tan\left(x\right)}$

$5.2+6.876$

$3ab+4ab-2ab$

$\frac{6x^3-11x^2-14x-2}{2x-5}$