$y''\:+\:4\:y'\:+\:13\:y\:=\:0$
$-67-23-\left(-64\right)+\left(-62\right)-28$
$\frac{d}{dx}\left(5x^3y^4+\frac{3y^2}{4x^3}=5xy\right)$
$3x\:+4ab\:-\:6x\:-6y\:+\:1ab\:-\:2y$
$\left(-7\right)\cdot\left(-12\right)-10$
$\lim_{x\to0}\left(\frac{1}{x^5\cdot\:\left(e^{\frac{1}{x}}-1\right)}\right)$
$\int\frac{x^2}{\sqrt{4-25x^2}}dx$
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