$y=y-y^3$
$\lim_{x\to0}3\left(\frac{1}{x}-cscx\right)$
$tan3a=\frac{3tana-tan^3a}{1-3tan^2a}$
$x\:^5y^4+xy^3$
$\left(-10\right)\left(-2\right)+15-\left(-4\right)$
$4^4-8y^2+16$
$u^2+8u+16\:$
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