$( 1 - 2 n ) ^ { 3 }$
$81x^2\:\left(x+3\right)-54xy\left(x+3\right)+9y^2\:\left(x+3\right)$
$\lim_{x\to7}\frac{x^2+4x-21}{x+7}$
$2x-1>37$
$-\frac{1}{3x^3}+c$
$3\cos^2a+\sin^2a=2$
$3\csc\left(x\right)+2=-4$
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