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3.14*(1/2)*(4/3)*2.5^3 = 0
1/2*3.14*(4/3)*2.5^3 = 0
1.57*(4/3)*2.5^3 = 0
4/3*1.57*2.5^3 = 0
2.0933333281*2.5^3 = 0
2.09333333*2.5^3 = 0
L <> R
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