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0(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0(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=[*] [*](exsiny+x—y)dx+(excosy+y)dy=∫02axdx=2a2, 所以∫L(exsiny+x—y)dx+(excosy+y)dy=[*]

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