$\frac{1}{1}mvf^2-\frac{1}{2}mvo^2$
$\lim_{x\to0}\left(\frac{cos\:x-x}{x^3}\right)$
$\frac{dy}{dx}=\frac{1}{y}$
$\cot x=\tan x+\cot x$
$11x+7\cdot11x+7$
$3y^2+2y$
$9x^2+3x+6+-3x^2+6x-2$
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