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((1/2)*(3.98^2+4*0.16^2)^1)/2-3.98*0.5+0.01 = 0
((1/2)*(3.98^2+4*0.16^2)^1)/2-3.98*0.5 = 0
-3.98*0.5 = 0
(4*5)/(3.1415*0.2^2) = 0
(4*5^2)/(3.1415*0.2^3) = 0
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