$\tan x=-2$
$\lim_{x\to0}\left(\frac{x-x\cos\left(x\right)}{sin\left(x\right)cos\left(x\right)}\right)$
$\lim_{x\to0}\left(\frac{2}{3+4\:^{\frac{1}{x}}}\right)$
$\left(19xy-25\right)-\left(24xy+42\right)$
$m+5m+1$
$\left(\frac{1}{x}+3x\right)^2\left(5x-1\right)$
$196cm^2\cdot14$
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