$\frac{2}{\left(2-\left(x-1\right)^2\right)}$
$15+1+17-2-4$
$\int\frac{x^2-x}{x\left(x+1\right)}dx$
$\int_1^{\infty}\left(\frac{x}{\sqrt{x^4-1}}\right)dx$
$\frac{4}{3}\left(90.3\right)$
$2\sec3x^2$
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