$81x^2-4v^2$
$\frac{\sqrt[3]{x}}{x}-4$
$\frac{dy}{dx}=-\left(-x-2\right)$
$\frac{sin3\theta}{sin\theta\:}-\frac{cos3\theta}{cos\theta\:}=2$
$\left(4x^3-8y\right)\left(4x^3+8y\right)$
$\left(-10+9y\right)\left(10+9y\right)$
$\left(8x^5+4y^7\right)^2$
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