$\frac{2}{x}-\frac{\sqrt{x^2-4}}{x}$
$\int\tan\left(x-7\right)dx$
$\left(4-\left(-9\right)\right)\cdot\left(-3\right)$
$\int\left(\sqrt{2+4t^2}\right)dx$
$\int winwdw$
$\int9xe^{15x}\:dx$
$-5+81$
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