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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
((2*x^-1)/3)*((x^5)/3-((4*x^1)/3)) = 0
((2*x^-1)/3)*((x^5)/3+(-4/3)*x) = 0
2/3*x^-1*(1/3*x^5-4/3*x) = 0
1/3*x^5-4/3*x = 0
1/3*x*(x^4-4) = 0
1*x^4 = 4 // : 1
x^4 = 4
x^4 = 4 // ^ 1/4
abs(x) = 4^(1/4)
x = 4^(1/4) or x = -4^(1/4)
1/3*x*(x-4^(1/4))*(x+4^(1/4)) = 0
1/3*2/3*x^-1*x*(x-4^(1/4))*(x+4^(1/4)) = 0
( 1/3*x )
1/3*x = 0 // : 1/3
x = 0
( 2/3*x^-1 )
2/3*x^-1 = 0 // : 2/3
x^-1 = 0
x należy do O
( x+4^(1/4) )
x+4^(1/4) = 0 // - 4^(1/4)
x = -4^(1/4)
( x-4^(1/4) )
x-4^(1/4) = 0 // + 4^(1/4)
x = 4^(1/4)
x in { 0}
x in { -4^(1/4), 4^(1/4) }
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