$49\cdot12$
$\frac{dy}{dx}=2+2y^2+2x+2xy^2$
$\frac{dy}{dx}-\frac{y}{x}=x+1$
$\lim_{x\to1}\left(\frac{\sqrt{5+x}-\sqrt{5}}{x}\right)$
$9y+3-4x-2y-3w$
$\int x^2\left(x^2+2x\right)^3dx$
$-\frac{x^{15}}{\left(x+5\right)^2}$
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