$cosx\left(cscx-secx\right)$
$20+\left(-2-3-5\right)-\left(20-30\right)$
$\frac{dy}{dx}\left(\:3x^2-x^2y+y^4=1\right)\:$
$\left(x^3-5x+2x-3\right)-\left(2x^3+5x^2-2x-3\right)$
$tanx\left(secx-1\right)\left(secx+1\right)$
$\frac{-11^{12}}{-11^8}$
$\frac{dy}{dx}=2xy\:and\:y\left(0\right)=12$
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