$\int\sqrt{4-25\:x^2}dx$
$\left(a^2-2ay+y^2\right)\left(a+y\right)$
$\left(x^3+4y^2\right)\left(x^3-4y^2\right)$
$\lim_{x\to e}\left(\frac{ln\left(x\right)-1}{2x-2e}\right)$
$\int\cot^7x\:dx$
$10\left(2x\right)^3\left(3\right)^2$
$4x^2-x+2$
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