Use the given identity to verify the related identity. Use the identity cosh(x + y) = cosh
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Use the given identity to verify the related identity.
Use the identity cosh(x + y) = cosh x cosh y + sinh x sinh y to verify the identity cosh 2x = cosh2 x + sinh2 x.
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Related Book For 
Calculus Early Transcendentals
ISBN: 978-0321947345
2nd edition
Authors: William L. Briggs, Lyle Cochran, Bernard Gillett
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