$\sin t\:+\:\frac{\cos^2t}{\sin t}$
$\sqrt{12}+\sqrt{108}=8.3\frac{1}{2}$
$\left(-12\right):4x\left(-5\right)-20:\left(-2\right)$
$\int e^{-3}dx$
$\frac{dy}{dx}=5y+e^{-2x}y^{-2}$
$\int\frac{x+3}{x^2+7x+6}dx$
$-4\:\left(-8\right)$
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