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prove that angle between the straight line whose direction cosine are given by l+m+n=0 and fmn+gnl+hlm=0 is π/3 if 1/f+1/g+1/h=0

prove that angle between the straight line whose direction cosine are given by l+m+n=0 and fmn+gnl+hlm=0 is π/3 if 1/f+1/g+1/h=0

Grade:12th pass

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