A、y=Acos[2πv(t+t0)+π/2]
B、y=Acos[2πv(t-t0)+π/2]
C、y=Acos[2πv(t-t0)-π/2]
D、y=Acos[2πv(t+t0)-π/2]
A、y=Acos[2πv(t+t0)+π/2]
B、y=Acos[2πv(t-t0)+π/2]
C、y=Acos[2πv(t-t0)-π/2]
D、y=Acos[2πv(t+t0)-π/2]
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