$2xy-9x^2+\left(2y+x^2+1\right)\frac{dy}{dx}=0$
$-4y-47=6y+13$
$\lim_{x\to\infty}\left(4\pi x^2\right)$
$7^3+x^2-7x^3-8x+12$
$x^2-4y^2=9$
$-3x+3>-2x+1$
$8x+14x^3$
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