Using a large sample of charm semileptonic decays collected by the FOCUS photoproduction experiment at Fermilab, we present new measurements of two semileptonic branching ratios. We obtain values of Γ(D +→ K ∗0μ +ν) Γ(D +→K −π +π +) =0.602±0.010( stat)±0.021( sys) and Γ(D s +→φμ +ν) Γ(D s +→φπ +) =0.54±0.033( stat)±0.048( sys) . Our D +→ K ∗0μ +ν result includes the effects of the s-wave interference discussed in Phys. Lett. B 535 (2002) 43.