Solve det(QI) = 0 by the quadratic formula, to reach = cos isin: Q = " cos sin sin cos #
Chapter 5, Problem 5.1.26(choose chapter or problem)
Solve det(QI) = 0 by the quadratic formula, to reach = cos isin: Q = " cos sin sin cos # rotates the xy-plane by the angle . Find the eigenvectors of Q by solving (QI)x = 0. Use i 2 = 1.
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