$=3\cos x-5\cot x$
$a\left(x+y+z\right)$
$\frac{dy}{dx}=4xy$
$7x+6\le3x-8$
$13x-4\:\:13x+4$
$\frac{dy}{dx}=x^2e^{-4x}-4y$
$-4\:+\:3\:\:x\:\:4\:$
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