Question: In exercises (u,v) is an inner product. prove that the given statement is an identity {u, v} = 1/4 ||u + v|| 2 - 1/4||

In exercises (u,v) is an inner product. prove that the given statement is an identity 

{u, v} = 1/4 ||u + v||2 - 1/4|| u - v||2

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