利用格林公式计算∫L(exsiny+x-y)dx+(excosy+y)dy,其中L是圆周y=(a>0)上从点A(2a,0)到点O(0,0)的弧段.

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问题 利用格林公式计算∫L(exsiny+x-y)dx+(excosy+y)dy,其中L是圆周y=(a>0)上从点A(2a,0)到点O(0,0)的弧段.

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答案I=∫L(exsiny+x-y)dx+(excosy+y)dy. =[*](exsiny+x-y)dx+(excosy+y)dy 而[*](exsiny+x-y)dx+(excosy+y)dy=[*]dσ=πa2/2, [*](exsiny+x-y)dx+(excosy+y)dy=∫0xdx=2a2, 所以,(exsiny+x-y)dx+(excosy+y)dy=(π/2-2)a2.

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