$\frac{dy}{dx}=\frac{-y^2\sin\left(x\right)}{\cos^2\left(x\right)}$
$\frac{dy}{dx}=10x-x^2$
$sin^2x\:=\:tan^2$
$9.478-7.3$
$x^2\:-\:16x=-63$
$24-\left(-20\right)$
$x^2=3+2x$
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