math, calculus
posted by Anonymous .
A 3dimensional structure is obtained from rotating the parabola y=x^2 about the yaxis. Each second, 2π units^3 of water is being poured into the structure from the top. When 8π units^3 of water has been poured in the structure, the instantaneous change in water height level is ab, where a and b are coprime positive integers. What is the value of a+b?
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