For what angle between and is ?

PHYSICS · Subjective · A Level · Physics · Mechanics and materials · Mechanics and materials

Problem

For what angle between a\mathbf{a} and b\mathbf{b} is ∣a+b∣=∣a−b∣|\mathbf{a}+\mathbf{b}|=|\mathbf{a}-\mathbf{b}|?

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