$\int\left[ln\left(e^x\right)+ln\left(e^{-x}\right)\right]\:dx$
$3a\sqrt{5}-b\sqrt{5}+\left(2a-3a\right)\sqrt{5}$
$345-\left(-23\right)$
$\frac{x^{2}+25}{x-2-x^{2}}$
$\cos^2\left(14x\right)-\sin^2\left(14x\right)$
$\frac{8}{x+9}=\frac{x+9}{18}$
$\left(5.85\cdot10^{-5}\right)-\left(6\cdot10^{-4}\right)$
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