$9x^4+6x^2$
$\left(-x^2-2y^2\right)^5$
$\frac{dy}{dx}=\frac{x}{1-y^2}$
$\left(2x^2+3\right)\cdot\left(2x^2-3\right)-4x^2$
$\int\frac{e^x}{x^{-2}}dx$
$a^2-24am^2x^2^2+144m^4x^4$
$x^3y^6+27z^3$
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