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## Homework Statement

[tex]\int\int(rsin2\vartheta)drd\vartheta[/tex]

sorry i dont see how to put the bounds in but they are 0<[tex]\vartheta[/tex]<[tex]\pi[/tex]/2 and 0<r<2acos[tex]\vartheta[/tex]

## Homework Equations

I know that r=sin[tex]\vartheta[/tex]

## The Attempt at a Solution

Im really not sure where to start my text is terrible. I really dont know how to treat it with the double angle.

thanks for any help

sorry meant to put converting polar to rectangular.

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