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D( x )
x^1 = 0
(x^4)/3 = 0
x^1 = 0
x^1 = 0
x = 0
(x^4)/3 = 0
(x^4)/3 = 0
1/3*x^4 = 0 // : 1/3
x^4 = 0
x = 0
x in (-oo:0) U (0:+oo)
((6*y^1)/2)/((x^4)/3) = ((12*y)/(x^1))/3 // - ((12*y)/(x^1))/3
((6*y^1)/2)/((x^4)/3)-(((12*y)/(x^1))/3) = 0
((6*y)/2)/((x^4)/3)-4*x^-1*y = 0
9*x^-4*y-4*x^-1*y = 0
x^-1*y*(9*x^-3-4) = 0
9*x^-3 = 4 // : 9
x^-3 = 4/9
-3 < 0
1/(x^3) = 4/9 // * x^3
1 = 4/9*x^3 // : 4/9
9/4 = x^3
x^3 = 9/4 // ^ 1/3
x = (9/4)^(1/3)
y/x = 0
x^-1*y = 0 // : y
x^-1 = 0
x należy do O
x = (9/4)^(1/3)
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