$\frac{10^{28}}{10^7}$
$7-5-\:-3\:x\:-5\:-\:-2$
$3a+7-11-9a$
$\lim_{x\to0}\left(\frac{x^2}{1-\cos\left(x^2\right)}\right)$
$\left(215^1\right)$
$csc\left(x\right)-cot\left(x\right)cos9$
$520a\:+\:\left[8a\:-\:3a\:+\:9a\:-\:\left(4a\:+\:2a\:-\:a\right)\right]\:$
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