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Show that double integral over R ( r2 sin(theta)) dr d(theta), where R is the region bounded by the semicircle r=2acos(theta), ABOVE THE INITIAL LINE...

? theta varies from...?

finally after 1st integration I got the value as

integral of___ to ___ -[(8a^3)/3] * [((cos^4)theta]...

Am I right till this step?...if not, please correct!

Thanks in advance

AG