A.y=Acos[2πv(t+to)+π/2] B.y=Acos[2πv(t-

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问题 A.y=Acos[2πv(t+to)+π/2]B.y=Acos[2πv(t-to)+π/2]C.y=Acos[2πv(t-to)-π/2]D.y=Acos[2πv(t+to)-π/2]

选项 A.y=Acos[2πv(t+to)+π/2]
B.y=Acos[2πv(t-to)+π/2]
C.y=Acos[2πv(t-to)-π/2]
D.y=Acos[2πv(t+to)-π/2]

答案 B

解析
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