$\tan\left(a+b\right)-\tan\left(a\right)$
$\lim_{x\to\infty}\left(\frac{e^{-x}}{1+ln\left(x\right)}\right)$
$1.21\cdot10^7$
$\lim_{x\to2}\left(\frac{x+\sin\left(2x\right)}{x-\sin\left(2x\right)}\right)$
$\frac{3}{x+5}>2$
$8^{-5}\cdot8^6$
$\frac{x^2-1}{x^3+x}$
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