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VectorAngle[RotationMatrix[Pi/2, {0, 0,1}].RotationMatrix[2Pi/3, {0, 1,0}].(1,1,0),(1,1,0)]
VectorAngle[RotationMatrix[Pi/2, {0, 0,1}].RotationMatrix[2Pi/3, {0, 1,0}].(1,1,0),(1,1,0)]
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