solve{(4/(3*pi)}*{(r1^3-r2^3)/(r1^2-r2^2)} - (2/pi){ r1-(r1-r2)/2}solve{(4/(3*pi)}*{(r1^3-r2^3)/(r1^2-r2^2)} - (2/pi){ r1-(r1-r2)/2}

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