Only one of the following two equations is an identity.
Chapter 6, Problem 71(choose chapter or problem)
Only one of the following two equations is an identity. Decide which equation this is, and give a proof to show that it is, indeed, an identity. For the other equation, give an example showing that it is not an identity. (For example, to show that the equation is not an identity, let Then the equation becomes which is false.)
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