$x^{9\:}-\:x^8+3x^7-x^6\::\:\left(-2x^4\right)$
$xy^3+xy$
$\int ln\left(x-6\right)dr$
$\frac{x^6+x^3-2x^2+3}{x^2-7}$
$\frac{dy}{dx}=y\:y\left(1\right)=-2$
$2xy-y-x-x$
$\int\frac{\sqrt{4x^2-1}}{x^2}\:dx$
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