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Rotation

• Rotating around one axis or another will come up a lot.

• Sample problem: Find a rotation about the y -axis that makes the vector (a,b,c) lie in the xy -plane. Given that a > 0 , make sure that the resulting x -value is positive, too.

• Solution: Rotating about the y -axis means multiplying by the y -rotation matrix
  
  
  
  
  which is

Mathematics of Projections - 09 MAY 95

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