$\int\frac{x^2}{\left(x^2+7\right)^{\frac{3}{2}}}dx$
$\frac{x^3-c^3}{x-c}$
$\left|3\right|+\left(-15\right)$
$21-x;\:x=10$
$6\tan^2-\cot\tan-15\cot^2$
$59=-3x+2$
$\frac{x^2+1}{x}\ge1$
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