$-x^3+4x^2-1\:para\:x=-2$
$\lim_{x\to0}\left(\frac{x^2}{\log\left(1+x^2\right)}\right)$
$\left(7m-3n^4\right)^2$
$\frac{\sin\left(x\right)}{1+\cos\left(x\right)}=2$
$x^3e^4x$
$\left(4m^2n+7nm^2\right)\left(-3m^2n+2mn^2\right)$
$e^{x+2y}=e^{2x-y}.y^'$
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