So if we talk about the probability density and we write that in, it's going to be sigma 1 s star squared, 1sb so now we're talking about 1 s a minus 1 s b, all of that being squared.
如果我们讨论概率密度,而且我们把它写出来,它等于sigma1s星的平方,现在我们说的是1sa减去,这整体再平方。
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