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bakin
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Homework Statement
Prove the identity:
Cosh(x) + Cosh(y) = 2Cosh[(x+y)/2]Cosh[(x-y)/2]
Homework Equations
Cosine sum-to-product
http://library.thinkquest.org/17119/media/3_507.gif
The Attempt at a Solution
Can you use the same formula for Cosine sum to product for hyperbolic cosine?
Thanks!
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