$\frac{1}{\left(1-x\right)^3}$
$\:15abc^3+45a^2bc$
$sec\left(2x\right)=-1.305$
$t^2-2t+1$
$\frac{d}{dx}arccos\frac{2x}{3}$
$n+2=n+4$
$\frac{\left(-4m^3b\right)}{10mn^2}2$
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