$6x^2-4x+6$
$3s-4s$
$\sec^2\left(a\right)+\sec^2\left(a\right).\sin^2\left(a\right)$
$\frac{d}{dx}\ln e^{-3t}$
$\lim_{x\to5}\left(\frac{x-5}{\sqrt{8}-\sqrt{x+3}}\right)$
$7x=21$
$-3x^{2}+14x-2$
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