$\frac{csc\left(t\right)-sin\left(t\right)}{cot\left(t\right)}$
$\frac{-3-8}{-1}$
$\left(x+y\right)-5\left(x-y\right)+5$
$\frac{-x}{2}=-6$
$\lim_{x\to\infty}\left(\frac{1}{7x+4}\right)$
$3\frac{dy}{dx}+4y=2$
$-7y+2=3-6y$
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