$\frac{1}{1+\sec^2x}$
$\left(-10\right)\cdot8-7$
$-400+3$
$\left(-d+6\right)\left(d+6\right)$
$4xy-2x^2=0$
$\left(7x-.5\right)\left(7x+.5\right)$
$\frac{d}{dx}\left(\frac{x^2+4x+4}{x}\right)$
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