$2x^2-x-15$
$\frac{5}{\sqrt{5}}\cdot\arctan\left(\frac{x}{\sqrt{5}}\right)$
$\frac{12x+21}{16x^2-49}$
$\left(3x\right)\left(9x-3\right)$
$\int-3\ln\left(x^2-1\right)dx$
$-0.6\left(27\right)$
$y=3lnx$
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