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OpenStudy (anonymous):
I'm taking a double integral of x^2*y^2*dA over D.(integration in polar coordinates) I know that when it comes to integration in polar coordinates x^2+y^2 = r^2 but how come x^2*y^2*dA = (r*cos(Q))^2*(r*sin(Q))^2
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OpenStudy (anonymous):
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