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Homework Statement
The problem and solution are included.
Homework Equations
Double integration.
The Attempt at a Solution
Firstly, I'd like to mention that the additional ρ under the square root is there accidentally and that it should be outside of the square root such that it forms the ending ρ dρ dθ.
I'm stuck at the sqrt(4a^2  ρ^2) ρ dρ step. I have a feeling that I need to use trigonometry with ρ = 2acosθ or ρ = 2asinθ but firstly, which of the two would I choose and secondly given that I then have to integrate with respect to θ, must I replace ρ with a variable other than θ? Why or why not?
Any help would be greatly appreciated!
Thanks in advance!
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