$\frac{dy}{dt}=-y\:\tan\left(t\right)$
$ydy=xdx$
$y'\:=\:\frac{2xy}{x^2-y^2}$
$15+2a-a^2$
$\frac{4}{\left(-4.1\right)^2+2\left(-5\right)-8}$
$9^0$
$\:\:12^{16}:\:6^4$
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