$\frac{8r^4}{2r}$
$\left(10x^3+y^4\right)^3$
$9-9y^8$
$3\:2^2\:-5\:2\:-1$
$2sin2x\:\left(1-2sin^2x\right)$
$\sqrt{1-8x^2}y'=x$
$\lim_{x\to-1}\left(-x^2+7x\right)$
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