... sóng.II. ĐÁP ÁN 1B, 2A, 3D, 4C, 5C, 6B, 7D, 8A, 9A, 10 D, 11 D, 12 A, 13 D, 14 B, 15 D, 16 A, 17 D, 18 D, 19 A, 20B, 21A, 22D, 23B, 24D, 25B, 26B, 27A, 28D, 29A, 30C, 31D, 32C, 33D, 34A, 35C. 19 A. Hai ... là đúng?A. tgϕ = 2 211 2 211 cosAcosAsinAsinAϕ−ϕϕ−ϕ B. tgϕ = 2 211 2 211 cosAcosAsinAsinAϕ+ϕϕ+ϕ C. tgϕ = 2 211 2 211 sinAsinAcosAcosAϕ−ϕϕ−ϕ D. tgϕ = 2 211 2 211 sinAsinAcosAcosAϕ+ϕϕ+ϕ38. ... 6D, 7D, 8C, 9C, 10 D, 11 D, 12 D, 13 A, 14 D, 15 A, 16 D, 17 C. 18 C, 19 A, 20B, 21A, 22C, 23B, 24A, 25B, 26D, 27C, 28A, 29C, 30C, 31A, 32D, 33B, 34D, 35D, 36A, 37B, 38D, 39D, 40C, 41D, 42D, 43A, 44B,...