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Z的分佈叫做瑞利(Rayleigh)分佈,具體求法: f(x,y)=[1/(2πσ^2)]*e^-[(x^2+y^2)/2σ^2] 當z=0時,有: F(z)=∫∫f(x,y)dxdy,其中積分區域為x^2+y^2
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