$8\cos\left(x\right)\cos\left(2x\right)$
$\left(b-15\right)\left(b+6\right)$
$\lim_{k\to1}\left(\frac{k^{\frac{4}{3\:}}+7}{\left(k+1\right)^{\frac{4}{3}}+7}\right)$
$\left(2x+6\right)\cdot\left(-2\right)$
$2xe^{-u}dx-x^2du$
$x\sqrt{\left(x^2-1\right)}^7xd$
$1\cdot10^{-15}$
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