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OpenStudy (anonymous):
For any θ, the vectors U = cosθI+ sinθJ, V = −sinθI+ cosθJ, form an orthonormal basis for the plane; that is, they are orthogonal vectors of length 1. Let θ = [(2π)/6], and X = 8 I+ 6 J. Then we can write X = uU+vV with u = ? , v = ?
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