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Transformationsmedium
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A transformation f(x,y)f(x, y)f(x,y) maps a point to (xcos⁡(90∘)−ysin⁡(90∘),xsin⁡(90∘)+ycos⁡(90∘))(x \cos(90^\circ) - y \sin(90^\circ), x \sin(90^\circ) + y \cos(90^\circ))(xcos(90∘)−ysin(90∘),xsin(90∘)+ycos(90∘)). Which specific geometric motion does this represent?