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March 14th, 2010, 05:05 AM   #1
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Given function, show that

Hello, I can't seem figure out how to do this one.

Problem: e^y=e^x+e^-x, show that d^2*y/d*x^2+(dy/dx)^2 - 1=0

I know that I have to find a derivative, but have been failing do it for a few days now.
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March 14th, 2010, 09:31 AM   #2
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Re: Given function, show that

y = ln(e^x + e^-x)

Can you continue from there?
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