$\frac{dy^2}{dx^2}=-\frac{5x^2}{4y}$
$8.1+-3.3$
$\lim_{x\to3}\left(\frac{\sqrt{x^2+7}-4}{\sqrt{x+1}-2}\right)$
$5-3x^2^7\sqrt[2]{6x^2+8x-12}$
$1000x^{18}-1$
$\frac{-4x-4}{-4}$
$\left(-4\right)+3+5\left(-6\right)+\left(-3\right)$
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