$\frac{dy}{dx}=-6xy\:$
$0.25x^2+10x+800$
$-7-47\cdot12-\left(-7\right)$
$x^2+8x-12y+4=0$
$\lim_{x\to0}\left(\frac{x^2+2x-8}{2x^2-4}\right)$
$-2\left(-5\right)\cdot\left(-10\right):2-\left(6-\left(-4\right)\cdot\left(-9\right)\right)$
$\frac{2x^{2n}-2y^{2n}}{x^n+y^n}$
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