Besides translating a point, it is also important in computer graphics to be able to rotate a

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Besides translating a point, it is also important in computer graphics to be able to rotate a point. This is achieved by multiplying a point’s column matrix by an appropriate rotation matrix R to form the matrix product RX. For example, to rotate a point 60°, the rotation matrix isimage


(a) Write the coordinates of the point (6, 4) after it has been rotated 60°.

(b) Find and interpret R−1.

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