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D( x )
x < 0
x < 0
x in <0:+oo)
V = (4/3)*x^3.14*x^512 // - (4/3)*x^3.14*x^512
V-((4/3)*x^3.14*x^512) = 0
V+(-4/3)*x^515.14 = 0
-4/3*x^515.14 = -V // : -4/3
x^515.14 = 3/4*V
x^515 = (3/4*V)^(1/0.14) // ^ 1/515
x = (3/4)^0.013869642851595*V^0.013869642851595
x = (3/4)^0.013869642851595*V^0.013869642851595
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