$\frac{3x^2y^2}{9xy}$
$x^4+0+9x^2+4x+12$
$\left(3x^2+2y\right)^3$
$\frac{d^{13}}{dx^{13}}\left(e^x+\sin\left(x\right)\right)$
$\frac{xy}{x^2y^2}$
$-4r^2+3r^2+-6r^2-3r^2$
$\int\left(\frac{1}{e^{2x}+2}\right)dx$
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