[A(cos theta,sin theta),B(sin theta-cos ...

[A(cos theta,sin theta),B(sin theta-cos theta)" are two points then centroid of triangle formed by "A,B" and origin "],[" lies on a circle whose centre and radius are "],[[" 1) "(1,1),sqrt(2/3)," 2) "(0,0),sqrt(2/3)," 3) "(0,0),sqrt(2/3)," 4) "(0,0),3/sqrt(2)]]

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