CP invariance condition and rephasing invariance in KM scheme of CP violation is discussed. The CP violation measures in B physics, corresponding to the three angles of unitarity triangle are given in rephasing invariant form. With the obtained results it is shown that the sum of the three CP angles to be measured at B factories becomes $pi$ even if the Kobayashi-Maskwa matrix is not a $3times 3$ unitary matrix under reasonable assumptions.
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