4.(20 points) Let Ω be the first-quadrant rregion bounded by the curves:
x2+y2=4，x2+y2=16，x2-y2=1,x2-y2=4
Evaluate 
阿摩線上測驗
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4.(20 points) Let Ω be the first-quadrant rregion bounded by the curves:
x2+y2=4，x2+y2=16，x2-y2=1,x2-y2=4
Evaluate