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Question: i would like to know how they get the answer...

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I would like to know how they get the answer πab.7.4 Let a >0, b0. Calculate the double integral dal 1 drdy, where G ((r, y) E IR2 (that is the area of region G). (Hint: carry out the substitution uand v and reduce the problem to the problem of computing the area of a circle.)

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