$-x+8\:\:2x+4$
$x^my^n-2x^my^n+4$
$\lim_{x\to\frac{\pi}{4}}\left(\frac{\cot\left(x\right)-\tan\left(x\right)}{\sin\left(x\right)-\cos\left(x\right)}\right)$
$\left(100\cos\:\left(20t\right)\right)^2$
$\left(5x-3y\right)\left(6x+7y\right)$
$3x-4xy+7xy+5xz-6xy-2xy+9xy+9xy-8x$
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