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D( x )
x < 0
x < 0
x in <0:+oo)
v = (4*x^0.343*x^3.1416)/3 // - (4*x^0.343*x^3.1416)/3
v-((4*x^0.343*x^3.1416)/3) = 0
v+(-4/3)*x^3.4846 = 0
-4/3*x^3.4846 = -v // : -4/3
x^3.4846 = 3/4*v
x^3 = (3/4*v)^(1/0.4846) // ^ 1/3
x = (3/4)^0.6878525164548081*v^0.6878525164548081
x = (3/4)^0.6878525164548081*v^0.6878525164548081
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