If b is perpendicular to a, mUltiply by the three matrices in 1 to get (cos 8)b and 0
Chapter 8, Problem 8(choose chapter or problem)
If b is perpendicular to a, mUltiply by the three matrices in 1 to get (cos 8)b and 0 and a vector perpendicular to b. So Q b makes an angle e with b. This is rotation.
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