Hello,
Would you be able to help me understand why my bounds are wrong? I listed by bounds as a = 3pi/2, b = pi/2, c = 1, and d = 3 as integral set up from a to b, integral c to d (frdrdt).
Thank you,
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiU_V6y1mxawhXgA0mrqWa4WM5r2LTMoi4a6iVsGK3BOw4AqrkkAF7ODbaKgcxe2TCF6EkqmsCXJyqkCWR8E9MXUOwgsonHVM58cUbcBErL4HTvMAQAPjsTjaLsD09IULJxSx8dxStWTlo/s640/12.3%25238.png)
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Well, there are a couple ways you got tangled up. First of all, your outer limits of integration refer to the angular variable on the negative and positive y-axis while your inner variable is θ, so that you either need to have θ on the outside or make c,d refer to the angular variable. Second, you have a bigger than b. That means when you do an integral that you are doing integral backwards, so that integral would be over the opposite half washer--the one with the negative x-values. I recommend that you use -π/2 to π/2 instead.