$\int\frac{x}{5x^2+5}\:dx$
$2x+1\cdot x-1$
$\int\left(x-3\right)\left(1-x\right)^{-3}dx$
$\int\frac{1}{\sqrt{1-\frac{1}{x}}}dx$
$-3x^2-20x-12$
$\left(x^2+2\right)\left(2x-1\right)$
$\int_{+\infty\:}^{12}\frac{1}{37}\:dx$
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