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(1 point) Let OABC be a parallelogram on the xy-plane, where O = (0, 0), A = (2,7) and C = (-3, 2). Find

(1 point) Let OABC be a parallelogram on the xy-plane, where O = (0, 0), A = (2,7) and C = (-3, 2). Find the angle between the diagonals of OABC arccos (0.5948430054102947) rad Answer =

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