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$-19\cos\left(x\right)+19=0$
$8^3\cdot8^6$
$\frac{dy}{dx}=\frac{x-1}{y+4}$
$\frac{\left(-3x^3y^2z\:2xy^4\right)}{2x^4y^3z^3}$
$\cos^2\left(x\right)+8\cos\left(x\right)+15$
$\left(x^2-a^2\right)\left(a^2-x^2\right)$
$\left(abc+9\right)\left(abc-9\right)$
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