Evaluate ∫xy dxdy over the positive quadrant of the circle x2+y2=a

1.	Evaluate ∫xy dxdy over the positive quadrant of the circle x2+y2=a2.
A.	\(\frac{a^4}{8} \)
B.	\(\frac{a^4}{4} \)
C.	\(\frac{a^2}{8} \)
D.	\(\frac{a^2}{4} \)
Answer» B. \(\frac{a^4}{4} \)

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