  The unitarity based analysis carried out in hep-ph/0106161, involving the
evaluation of Jarlskog's rephasing invariant parameter J and the angles of the
unitarity triangle is extended to include the effects of K^0-\bar K^0 and
B^0-\bar B^0 mixings. The present analysis attempts to evaluate CP violating
phase \delta, V_{td} and the angles of the unitarity triangle by invoking the
constraints imposed by unitarity, K^0 -\bar K^0 and B^0 -\bar B^0 mixings
separately as well as collectively, using the "full scanning" of input
parameters. Interestingly, our results indicate that the lower limit of \delta
is mostly determined by unitarity, while the upper limit is governed by
constraints from \Delta m_{B_d}. Our analysis yields sin2\beta=0.50-0.88, which
is in agreement with the BABAR results, however has marginal overlap only with
the lower limit of recent BELLE results.
