$\left(5a+3b\right)\left(3a-5b\right)=15a^2-15b^2$
$\lim_{x\to0}\left(\frac{e^x}{1-e^x}\right)$
$\left|\left(-18\right)+\left(+13\right)\right|+\left(+7\right)$
$8x^6-125$
$-2x\le-6$
$\lim_{x\to1}\left(\frac{cosx-1}{x-1}\right)$
$\left(cotx\left(sinx+cosx\right)\right)$
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