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    copied!<p>Use <a href="http://wolframalpha.com" rel="nofollow">http://wolframalpha.com</a> . For example, as discussed by Mysticial, your calculation of log(exp(-1.6430e+03) + exp(-3.8278e+03)/2) is approximately equal to log_a. More precisely it equals...</p> <p>1642.9999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999288154175193167154874243862288962865800888654829363675488466381404578225092913407982036991983506370017587380105049077722517705727311433458060227246074261903850589008701929721367650576354241270720062760800558681236724831345952032973775644175750495894596292205385323394564549904750849335403418234531787942293155499938538026848481952030717783105220543888597195156662520697417952130625416040662694927878196360733032741542418365527213770518383992577797346467266676866552563022498785887306273550235307330535082355570343750317349638125974233837177558240980392298326807001406291035229026016040567173260205109683449441154277953394697235601979288239733693137185710713089424316870093563207034737497769711306780243623361236030692934897720786516684985651633787662244416960982457075265287065358586526093347161275192566468776617613339812566918101457823704547101340270795298909954224594...</p>
 

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