$\int\frac{4}{x\left(x+2\right)}dx$
$\left(2x^a+13\right)\left(2x^a-8\right)$
$2\left(-a+1\right)+-7$
$10^7-2^2$
$\left(-17\right)\cdot\left(-6\right)$
$\frac{sin\left(x\right)}{secx+1}$
$\lim_{x\to0}\left(x^3-\left(\sqrt{5x^2+3x}\right)\right)$
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