$\cos\left(x\right)\sec\left(x\right)-\sin^2\left(x\right)$
$18x\frac{2}{9}$
$\frac{dy}{dx}=\frac{2y+3}{x^2-9}$
$x^2+20x+36=0$
$21-3x^2\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:$
$\frac{dy}{dx}=\frac{x+1}{y^{-2}}$
$-8\:-\left(-2\right)$
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