So, at that point, the partial derivative is zero with respect to x.
因此这点上x的偏导为零。
But now it looks like some function of x,y, z equals zero.
但是现在它看起来像x，，y，，z，的函数等于，0。
Why is that? Well, let's say that f sub x is zero.
为什么呢？我们令fx为。
It was the apple, x0 and I call that position x zero.
原来是苹果的位置，记作。
x y It's really the same thing. So, x, y, let's see, where is this function equal to zero?
实际上是相同的，函数值为0的点在哪里？
x y It's really the same thing. So, x, y, let's see, where is this function equal to zero?
实际上是相同的，函数值为0的点在哪里？
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