$-70-93$
$\frac{dy}{dx}=\frac{6x-x^3}{2y}$
$\sin^4u-\cos^4u=2\:\sin^2u-1$
$\left(12a^2-4b^3\right)\:\left(12a^2+4b^3\right)$
$354+432$
$\left(3\sqrt{x}+4\right)\left(3\sqrt{x}-4\right)$
$-10^2\:-\:\left(-10\right)^2$
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