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प्रश्न
If `veca, vecb, vecc` are mutually perpendicular vectors of equal magnitudes, find the angle which `veca + vecb + vecc`make with `veca or vecb or vecc`
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उत्तर
Thus, angle between `veca` and `veca+vecb+vecc` is `cos^(-1) (1/sqrt3)`
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