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]

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]

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