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ÁîP=Integral{e^(-1/2*x^2)*dx ,-¡Þ,¡Þ}
P^2=Integral{e^(-1/2*x^2)*dx ,-¡Þ,¡Þ}*Integral{e^(-1/2*y^2)*dy ,-¡Þ,¡Þ}
     =Double Integral{e^[-1/2*(x^2+y^2)]*dx*dy,x=-¡Þ~¡Þ,y=-¡Þ~¡Þ}
     =Double Integral{e^(-1/2*r^2)*r*dr*d¦È,r=0~¡Þ,¦È=0~2*¦Ð}
     =Integral{d¦È,¦È=0~2*¦Ð}*Integral{e^(-1/2*r^2)*r*dr,r=0~¡Þ}
     =2*¦Ð*Function{-e^(-1/2*r^2),0,¡Þ}
     =2*¦Ð
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2Â¥2014-10-24 16:05:43
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elastic

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3Â¥: Originally posted by elastic at 2014-10-24 20:50:42
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ÒýÓûØÌû:
2Â¥: Originally posted by peterflyer at 2014-10-24 16:05:43
ÁîP=Integral{e^(-1/2*x^2)*dx ,-¡Þ,¡Þ}
P^2=Integral{e^(-1/2*x^2)*dx ,-¡Þ,¡Þ}*Integral{e^(-1/2*y^2)*dy ,-¡Þ,¡Þ}
     =Double Integral{e^*dx*dy,x=-¡Þ~¡Þ,y=-¡Þ~¡Þ}
     =Double Integral{e^(-1/2*r^2)*r ...

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