$\frac{2\cos\left(x\right)}{\cos^2\left(x\right)-1}$
$\frac{7^{5}\cdot7^{3}}{7^{4}}$
$9x-14y+9+13y$
$2x^2-x-2$
$w^2-8w+16=0$
$\left(\frac{2}{3}x+\frac{1}{11}\right)\left(\frac{3}{5}x-\frac{7}{12}\right)$
$\frac{dy}{dx}\left(6+cos\left(x\right)\right)^x$
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