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Using a sample of 1.8 million DDbar meson pairs collected at the psi(3770)with the CLEO-c detector, we study the semileptonic decays D^0 -> pi^- e^+nu_e, D^+ -> pi^0 e^+ \nu_e, D^0 -> K^- e^+ \nu_e, and D^+ -> Kbar^0 e^+ nu_e.For the total branching fractions we find B(D^0 -> pi^- e^+ \nu_e) =0.299(11)(9)%, B(D^+ -> pi^0 e^+ \nu_e) = 0.373(22)(13)%, B(D^0 -> K^- e^+nu_e) = 3.56(3)(9)%, and B(D^+ -> Kbar^0 e^+ nu_e) = 8.53(13)(23)%, where thefirst error is statistical and the second systematic. In addition, form factorsare studied through fits to the partial branching fractions obtained in fiveq^2 ranges. By combining our results with recent unquenched latticecalculations, we obtain |Vcd| = 0.217(9)(4)(23) and |Vcs| = 1.015(10)(11)(106),where the final error is theoretical.

A Study of the Semileptonic Charm Decays D^0 --> pi^- e^+ nu_e, D^+ --> pi^0 e^+ nu_e, D^0 --> K^- e^+ nu_e, and D^+ --> barK^0 e^+ nu_e