SIN 2-BETA FROM K-]PI-NU(NU)OVER-BAR

We point out that the measurement of just the two branching fractions B(K+ --> pi+nunuBAR) and B(K(L) --> pi0nunuBAR) can in a theoretically clean manner determine sin 2beta almost independently of m(t) and V(c b). This allows to obtain an interesting relation between the CP asymm etry A(CP)(psiKs) in B physics and the branching ratios for these two rare K decays. The recently calculated next-to-leading order QCD corre ctions improve the accuracy of this analysis. We find typically DELTA sin 2beta = +/-0.11 provided B(K+ --> pi+nunuBAR) and B(K(L) --> pi0nu nuBAR) are measured within +/-10% accuracy. With decreasing uncertaint y in LAMBDA(MSBAR) and m(c) this error could be reduced to DELTA sin 2 beta < +/-0.10. The determination of sin2alpha and sin2gamma on the ot her hand is rather poor. However respectable determinations of the Wol fenstein parameter eta and of \V(td)\ can be obtained.