∫∫﹙下面D)e^(x²+y²)dxdy,D=﹛﹙x,y)|a²≤x²﹢y²≤b²﹜,其中a>0,b>o
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∫∫﹙下面D)e^(x²+y²)dxdy,D=﹛﹙x,y)|a²≤x²﹢y²≤b²﹜,其中a>0,b>o
∫∫﹙下面D)e^(x²+y²)dxdy,D=﹛﹙x,y)|a²≤x²﹢y²≤b²﹜,其中a>0,b>o
∫∫﹙下面D)e^(x²+y²)dxdy,D=﹛﹙x,y)|a²≤x²﹢y²≤b²﹜,其中a>0,b>o
原式=∫dθ∫(e^r²)rdr (做极坐标变换)
=(2π)(1/2)∫(e^r²)d(r²)
=π(e^b²-e^a²)