Question: What relation must be valid between the vectors (mathbf{a}) and (mathbf{b}), which are different from each other and nonzero, so that the relation: ((mathbf{a}+mathbf{b}) times(mathbf{a}-mathbf{b})=0)

What relation must be valid between the vectors $\mathbf{a}$ and $\mathbf{b}$, which are different from each other and nonzero, so that the relation: $(\mathbf{a}+\mathbf{b}) \times(\mathbf{a}-\mathbf{b})=0$ is verified?

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