$\lim_{x\to\infty}\left(\frac{e^{x^2}}{1-x^3}\right)$

$4y^2=\frac{3x-2}{3x+2}$

$\frac{tgx-\frac{1}{senx.cosx}}{tgx-\frac{1}{senx.cosx}}$

$\int\frac{2x^2+2}{x^3+3x}\:dx$

$\left(a^{\frac{1}{2}}\:-a\right)\:\left(a^2\:+a\:^{\frac{1}{3}}\right)$

$x^2-2x+4=3$

$\left(8a^2-x\right)^3$