2 - 2ΛΠDA, U = ACOS( ΩT + 2ΠΛD ) B, U = ACOS2ΠFT C, U = ACOS ( )T
2
-2
λπd
a, u = acos( ωt +2
πλd
) b, u = acos2πft c, u = acos ( )T
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2
-2
λπd
a, u = acos( ωt +2
πλd
) b, u = acos2πft c, u = acos ( )T