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D( x )
x < 0
x < 0
x in <0:+oo)
V = 3*(((4/3)*x^1*x^3.14)/2) // - 3*(((4/3)*x^1*x^3.14)/2)
V-(3*(((4/3)*x^1*x^3.14)/2)) = 0
V-2*x^4.14 = 0
-2*x^4.14 = -V // : -2
x^4.14 = V/2
x^4 = (V/2)^(1/0.14) // ^ 1/4
abs(x) = (V^1.785714285)/(2^1.785714285)
x = (V^1.785714285)/(2^1.785714285) or x = -((V^1.785714285)/(2^1.785714285))
x in { (V^1.785714285)/(2^1.785714285), -((V^1.785714285)/(2^1.785714285)) }
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