$dx=\:x\sqrt{x^2-16}dy$
$9-\int x\left(2+x^{2}\right)dx$
$7x^2+9x-130$
$\left(b+7\right)\left(b-4\right)$
$\int3x^2sin\left(x\right)\:dx$
$-230-280$
$\lim_{x\to5}\left(x\:+e^x\right)^{\frac{2}{x}}$
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