Two adjacent sides of a parallelogram ABCD are given by ˆˆˆ21011=++ABijk and ˆˆˆ22=-++ADijk. The side AD is rotated by an acute angle a 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 a is given by?

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Two adjacent sides of a parallelogram ABCD are given by ˆˆˆ21011=++ABijk and ˆˆˆ22=-++ADijk. The side AD is rotated by an acute angle a 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 a is given by?

Two adjacent sides of a parallelogram ABCD are given by ˆˆˆ21011=++ABijk and ˆˆˆ22=-++ADijk. The side AD is rotated by an acute angle a 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 a is given by?

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Two adjacent sides of a parallelogram ABCD are given by ˆˆˆ21011=++ABijk and ˆˆˆ22=-++ADijk. The side AD is rotated by an acute angle a 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 a is given by?

Two adjacent sides of a parallelogram ABCD are given by ˆˆˆ21011=++ABijk and ˆˆˆ22=-++ADijk. The side AD is rotated by an acute angle a 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 a is given by?

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