$2\cos^2\left(x\right)=-\cos\left(x\right)$
$x^4+2x^3-3x^2$
$\left(4x^{2a+1}y^{3a}\right)\left(-5x^{3a-2}y^4\right)$
$\left(x+8\right)=0$
$8x^2-\:50$
$\frac{dy}{dx}=\frac{y}{81x^2+1}$
$\frac{1}{4}\cdot1.25$
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