$\int\cot^2\pi xdx$
$m^2-x^2$
$e2lnx=9$
$-18+-12+-18$
$\left(7+x\right)\left(7-x\right)^4$
$\frac{x^2-4}{x^2-2x}$
$\int\frac{2x}{x^2-49}dx$
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