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Feb19-12, 06:18 PM
I'm not sure I understand what you mean by the parametric equations.. how does that fit into what I already have?
You were doing alright until after you drew the triangle. But you want to get rid of all of the x's in the thing you are integrating. And you never used dx=a cos(θ) dθ, probably because you weren't writing the dx in the integration. You need that.