$\left(3x^{2}-2\right)\cdot\left(3x^{3}+7\right)$
$1-8x^5+15$
$\int\frac{7\sqrt{x^2-25}}{x^4}dx$
$2x^3-5x^2-x+6$
$\lim_{x\to0}\left(\frac{lnx-1}{x-e}\right)$
$2ydx=3xdy\:when\:x=2.\:y=1$
$\frac{dy}{dx}+4y=5sin3x$
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