1618. Verifying identities Use the given identity to
Chapter 6, Problem 17(choose chapter or problem)
1618. Verifying identities Use the given identity to verify the related identity. Use the identity cosh 2x = cosh2 x + sinh2 x to verify the identities cosh2 x = cosh 2x + 1 2 and sinh2 x = cosh 2x - 1 2 .
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