$5x\cdot5y$
$\frac{dy}{dx}=\frac{y}{x}-\frac{y^2}{x}$
$\lim_{x\to\frac{\pi}{2}}\left(\cos\left(2x\right)\right)^{-\frac{\pi}{2}}$
$\left(3z^5\:+7z^2\right)^2$
$4x^2y^3+6x^2y+2x^2y^4$
$4x\cdot4x+5$
$10n-5\:15n-5\:12n+2$
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