A. ＝Acos（2πt／T-π／2-2π ／λ）
B. ＝Acos（2πt／T-π／2+2π ／λ）
C. ＝Acos（2πt／T+π／2-2π ／λ）
D. ＝Acos（2πt／T-π／2π ／λ）
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