$\frac{-\left(2xy^2\right)^{-2}}{\left(3x^{-2}-y^{-3}\right)^2}$
$-3\:x\:2$
$8xy+4i-8yx-3i$
$\lim_{x\to\infty}\left(\frac{4x^7}{x^7-6}\right)$
$7y+5y-5y$
$\frac{dy}{dx}\left(y=\frac{x^2}{y^3}\right)$
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