$3x^2+2x-2xy$
$5\left(f\:+\:1\right)\:=\:60$
$2x+1=9\left(3x-11\right)$
$8\left(r+2\right).$
$\lim_{x\to0}\left(\frac{sen\left(x\right)}{1-e^x}\right)$
$3w-12\le9$
$\tan\left(x\right)^2\cot\left(x\right)^3$
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