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∫∫xy²dxdy=∫y²dy∫xdx
=∫y²[p²/4-y^4/(4p²)]/2dy
=(1/4)∫(p²y²-y^6/y²)dy
=(1/4)[p²y³/3-y^7/(7p²)]
=(1/4)(p^5/3-p^5/7)
=p^5/21.
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