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s.perkins
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Homework Statement
Show that cosh^2(x) = (cosh(2x) - 1)/2
Homework Equations
cosh(x) = (e^x + e^-x)/2
The Attempt at a Solution
I have attempted this multiple times and get the same results every time.
Squaring cosh(x) I get 1/4(e^2x + e^-2x +2), which is i believe 1/4(cosh(2x) +2).
Maybe i just can't see it but how it that equivalent to the identity above??
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