$3x-2y=7\:$
$1^3-2^2$
$\frac{1}{\cos^2a}-1=\tan\left(a\right)$
$\:dydx\:=\sqrt{ax+b}$
$144-b^2$
$5x^2-\:15x\:+\:3$
$\left(-50\right)\cdot\left(-7\right)$
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