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ylslaa
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at the very end it should say "in the xy plane."

hcmathkim
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um..

hcmathkim
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R is an upper half of a disc that has a radius between 0 and 4

hcmathkim
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double integral of r^2 r bounded from 0 to 4 theta from 0 to pie

hcmathkim
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sqr rt ( x^2+y^2) is r , jacobian gives another r; that's why it's r^2

ylslaa
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that's not the answer tho..

mahmit2012
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dw:1354777378981:dw

mahmit2012
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i put 0 instead 1 !!

ylslaa
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where did the 1 come from?

mahmit2012
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dw:1354777491217:dw

ylslaa
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thank you:)

mahmit2012
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uw