$\left(1+e^x\right)ydy=e^xdx$
$3ax^2+6ax+3a$
$\left(a^2-9\right)\left(a^2-4\right)$
$\frac{2x^2+11x+17}{x+4}$
$-10x^3+52x^2-70x+12$
$\int\frac{7\sqrt{x^2-25}}{x^4}dx$
$\frac{d}{dx}\frac{x^3+2x}{1-x^2}$
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