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$28-4x-3+3x$
$5.009+2.3+0.28$
$\left(2y-3a\right)^2$
$3.78\:.\:4.5$
$\int\left(xcos^2\left(6x\right)\right)dx$
$\lim_{x\to0}\left(\frac{\cos\left(9x-\:1\right)}{x^2}\right)$
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