$\frac{\cos\left(x\right)+\sin^3\left(x\right)-\sin\left(x\right)}{\sin\left(x\right)}=csc\left(x\right)-\cos^2\left(x\right)$
$2x^2+5\le0$
$x^2-8x=-9$
$\left(2ye^{8x}\right).\frac{dy}{dx}=3e^{3x}e^{2y}+9e^{2y}$
$-4x^2+8x-4$
$\frac{-10n^2}{21}\cdot\frac{-6n^4}{25}$
$\sin x=\frac{1}{3}$
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