$\int\frac{1}{x^2\left(1+x^2\right)}dx$
$x^2+2\sqrt{3x}+3$
$a^2+21a-20$
$\cot^2\left(x\right)=1$
$3+2+5+3+2+7+1$
$14.3+\left(-17.25\right)$
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