$\frac{dy}{dx}=\frac{x}{sec^2y}$
$\left(d\:+\:1\right)^3$
$4x^2-y^2+\left(2x-y\right)$
$17y^2+-30y^2$
$xy'=2y+3x$
$2x^2-3x-6$
$-6561-2187$
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