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MATH / Let a, b, c be three vectors with equal magnitudes, and such that any pair of them are orthogonal. If θ is the angle between a and a+b+c, then find cosθ. · Discussion

Discussing Let a, b, c be three vectors with equal magnitudes, and such that any pair of them are orthogonal. If θ is the angle between a and a+b+c, then find cosθ. · MATH

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