$axy-xy$
$\int x\left(\frac{e^{2t}+e^t}{e^t+\:1}\right)dx$
$3x+2=26$
$2\cos^2x-4\cos x-3$
$\left(4x^2y+3\right)\left(4x^2y-3\right)$
$\lim_{x\to0}\left(\frac{cos6x\left(tan6x\right)}{x}\right)$
$\lim_{x\to-2}\:2x+1$
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