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\int_{t = 0}^{2 pi} \int_{p = 0}^{ pi} \int_{r = R_1}^{R_2} (rho_o / R_1^2) r^2 r^2 sin(p) dr dp dt
\int_{t = 0}^{2 pi} \int_{p = 0}^{ pi} \int_{r = R_1}^{R_2} (rho_o / R_1^2) r^2 r^2 sin(p) dr dp dt
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