$x-9=5y+3$
$\cos^2\left(2u\right)-4=0$
$\frac{2n}{n}$
$\frac{x^2}{x^3-1}$
$\left(20^2+7x-40\right)$
$\left(x+\frac{1}{2}\right)\left(x-\frac{1}{2}\right)$
$2\sin^2x+2\cos^2x\cdot\sec^2x-\tan^2x$
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