$\left(2\cos\left(20\right)+\sqrt{3}\right)\left(2\cos\left(20\right)-\sqrt{3}\right)\cos\left(20\right)$
$\frac{x^3-x^1-1}{x^2-1}$
$\left(2x-6p\right)\left(2x+6p\right)$
$9-3x^2-7x^2$
$\left(x-8\right)\left(y-6\right)$
$\frac{dy}{dx}=4y+20$
$xy^'+2y=\ln\left(x\right)$
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