Solve (e^x+e^(-x))/2 = 3

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Am I typing this into my calc wrong? I get a negative solution for... 3- square root of 8 equaling -1.76

JeanineKeller
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excelent, thanks for the explication...

percyduartegalvez
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But why 2 times 3 why not 2 power -1 on minutes 0:16 ????

moyqbdi