$\frac{\tan\:\left(6x\right)-\tan\:\left(2x\right)}{1+\tan\:\left(6x\right)\cdot\:\tan\:\left(2x\right)}$
$\left(26m-n^2\right)\left(26m+n^2\right)$
$\left(-82\right)\cdot\left(-42\right)$
$\int9e^{3x}dx$
$\int\frac{\cos\left(2x\right)}{e^{3x}}dx$
$\lim_{b\to\infty}\left(b\left(-e^{-b}\right)\right)$
$\frac{1}{\sqrt{1-\cos^2\left(x\right)}}=\csc\left(x\right)$
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