$\lim_{x\to3}\left(\frac{x^2-2x-3}{2x^2-6}\right)$
$\frac{dx}{dt}=-2-t$
$3x+2y=4$
$\left(-2\right)\left(10\right)\left(-21\right)$
$7x^2-2x+4=0$
$\csc^3\left(w\right)=\frac{\cot^3\left(w\right)+\cot\left(w\right)}{\cos\left(w\right)}$
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