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