$\lim_{x\to0}\left(\left(11x\right)cot\left(x\right)\right)$
$\left(-\:m+8\right)\left(-m-8\right)$
$\sqrt{25+5\tan\left(x\right)^2}$
$3\sin\left(x\right)+\cot\left(x\right)=0$
$\frac{27m^3-125n^3}{m-n}$
$cos\left(4x\right)=cos^2\left(2x\right)-sin^2\left(2x\right)$
$\int\tan x\cot xdx$
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