$\left(3x^3+2x^2\right)\left(3x^3-2x^2\right)$

$\lim_{x\to0}\left(\frac{e^{2x^2}-1}{sen^2\left(x\right)}\right)$

$1-\frac{1}{x+1}$

$7\sqrt{xy}$

$\left(-5+4\right)+\left(6-8\right)\cdot\left(5-7\right)$

$\left(\frac{1}{x^3}\right)\left(\sqrt[3]{x^{12}}\right)$

$\frac{d^2y}{dx^2}+x=0$