$\left(-5k^2+6x+7\right)+\left(-x^2+4x\right)$
$\frac{dy}{dx}=3ycos\left(x\right)-2cos\left(x\right)$
$x+19=40$
$\int\frac{1}{r^3+r^2-2r}dr$
$\int\left(x\right)\sqrt{49-x^2}dx$
$s^{3}-\left(-2\right)+4\left(\frac{1}{2}\right)$
$\int\frac{13x-12}{x^2-3x+2}dx$
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