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Let a = (0, - 3, 5) and b = (4, 5, 3). Find a . b.Let a = ( - 2, - 4, 4) and b = ( - 2, 2, - 5). Find the angle between the vector (in radians)Let a = ( - 2, - 1, - 4) and b = (5, 3, 4). Find the projection of b onto a. proj b