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If lamdaveca+muvecb+gammavecc=0, where v...

If `lamdaveca+muvecb+gammavecc=0, where veca,vecb,vecc` are mutually perpendicular and `lamda, mu, gamma` are scalars prove that `lamda=mu=gamma=0`

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Solved lamdavecr+(veca.vecr)vecb=vecc,lamda!=0