$sec^2x-\frac{sec^2x}{csc^2x}$
$-6\left(-12\right)$
$\left(3x+1\right)\frac{dy}{dx}=y+2$
$3\left(f+2\right)$
$\left(2-3x\right)^{-0.5}$
$\lim_{x\to0}\left(\frac{x-1}{1-cos\left(\pi x\right)}\right)$
$\left(-9x+13y\right)+\left(-16y-7x\right)+\left(-9x+13y\right)+\left(-16y-7x\right)$
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