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Transformationshard
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Given a transformation T(x,y)=(xcos⁡θ−ysin⁡θ,xsin⁡θ+ycos⁡θ)T(x, y) = (x \cos \theta - y \sin \theta, x \sin \theta + y \cos \theta)T(x,y)=(xcosθ−ysinθ,xsinθ+ycosθ), which of the following is true for all values of θ\thetaθ?