$\frac{\left(2\:x\:y\:-\:21\:x^2\:y^2\:+\:10\:x\:y^3\right)}{-2\:x\:+\:y}$
$\int3\left(3x-1\right)^2dx$
$x^2-49y^2$
$\frac{d^5}{dx^5}\tan\left(x\right)$
$8m^3-125f^3$
$\lim_{x\to1\:}\:\frac{x^3-1}{x-1}$
$\left(9z^4+3z^2-1\right)\left(3z^2-1\right)$
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