$\frac{dy}{dx}=10x\sqrt{25-y^2}$
$\left(7k-4e\right)\left(4e+7k\right)$
$64x^2y^2-32xy+4$
$\frac{64x^6-4^6}{2x+4}$
$\frac{\left(x^3+4x^2-6x\right)}{3x}$
$4-2^3-5-3^2-9-4+20$
$x+2y+2x+78$
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