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f(x)=[√(a²;+b²;)]sin(wx+m),其中tanm=b/a, T=π=2π/|w|,w>0,即w=2 (π/12)*2+m=π/2+2kπ,k是整數,即m=π/3+2kπ √(a²;+b²;)=4 綜上,得 f(x)=4sin[(π/6)x+(π/3)]
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