Which one of the following relations among the direction cosines of any vector in…

MATHEMATICS · Single correct · CBSE · Mathematics · Vector Algebra · Vector Algebra

Problem

Which one of the following relations among the direction cosines l,m,nl, m, n of any vector in three-dimensional space is always satisfied? (a) l+m+n=1l+m+n=1 (b) ∣l∣+∣m∣+∣n∣=1|l|+|m|+|n|=1 (c) l2+m2+n2=1l^{2}+m^{2}+n^{2}=1 (d) l2+m2+n=1l^{2}+m^{2}+n=1

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