ID_公式曲线 [公式曲线(expression curve)] ID_y=hsinkx [正弦曲线(&y=hsinkx)]^C^C_y=hsinkx
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但是，如果曲线不是封闭的，不能直接使用格林公式。
But, you can't use Green's theorem directly if the curve is not closed.
如果运用一下格林公式，你就发现当沿着一个逆时针的曲线时，结果就是区域的面积。
And, now, if you apply Green's theorem, you see that when you have a counterclockwise curve, this will be just the area of the region inside.
这是封闭曲线，所以我们可以用格林公式。
That's a closed curve. So, I would like to use Green's theorem.
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