$\int_1^{\infty}\left(\frac{x+1}{x\left(x^2+1\right)}\right)dx$
$2x\le7$
$\left(\frac{\sin\left(x\right)}{\cos\left(x\right)}\right)^2-\frac{1}{\cos\left(x\right)}+1$
$001x^2-06x+9$
$x^2-\left(x-2y\right)^2$
$17\left(30a\right)-630$
$2^2:\:-1$
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