The region R is the unit square with corners at (0,0),(1,0),(0,1) and (1,1).
The idea is to consider the geometric series.
Any help would be appreciated. Thank you
Answer
I collect all hints and write down the answer.
- We use the formula for sum of a geometric series as following
11−x2y2=1+x2y2+x4y4+…. - Then we have
∫R11−x2y2dxdy=∫R∞∑n=0x2ny2ndxdy=∞∑n=0∫Rx2ny2ndxdy. - And ∫Rx2ny2ndxdy=∫10∫10x2ny2ndxdy=1/(2n+1)2.
- Finally
∫R11−x2y2dxdy=∞∑n=01(2n+1)2.
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