$\int\frac{e^{-x}}{\left(9e^{-2x}+1\right)^{\left(\frac{3}{2}\right)}}dx$

$\lim_{x\to1}\left(\ln\left(x\right)\right)$

$\frac{2n^2-2}{3n^2}$

$20+90+51zy$

$\frac{x^2+3}{x^2-1}<-2$

$\lim_{x\to4}\left(\frac{x^2+3x+2}{x^2-1}\right)$

$\sqrt{\frac{2ab\sqrt[3]{2a^2b}}{\sqrt[6]{2ab}}}$