If ki,mi,ni;I=1,2,3 denote the direction of three mutually perpendicular vectors in space,prove that AA'=I,
where A= l1 m1 n1
l2 m2 n3
l3 m3 n3
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Given denote the direction cosines of three mutually perpendicular vectors in space.
Then,
Given,
Then,
Hence proved.
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