$\frac{d}{dx}x^2e^{-4x}$
$3x^2+2x-1=0$
$\left(2\right)\left(-3\right)-\left(4\right)\left(-2\right)$
$\cos\left(x\right)=-\frac{7}{10}$
$\frac{cos^2x}{sinx}=cscx\:-\:sinx$
$\left(x+y^3\right)^3$
$\frac{dy}{dx}=y\left(y+1\right)$
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