Two adjacent sides of a parallelogram ABCD are given by vec AB = 2vec i 10vec j 11vec k and vec AD = - vec i 2vec j 2vec k . The side AD is rotated by an acute angle alpha in the plane of the parallelogram so that AD becomes AD' . If AD' makes a right angle with the side AB , then the cosine of the angle alpha is given by
Two adjacent sides of a parallelogram ABCD are given by …
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