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D( x )
((64*x^8)/27)*y^-4 < 0
((64*x^8)/27)*y^-4 = 0
((64*x^8)/27)*y^-4 < 0
((64*x^8)/27)*y^-4 < 0
((64*x^8)/27)*y^-4 = 0
64/27*x^8*y^-4 = 0 // : 64/27*y^-4
x^8 = 0
x = 0
x < 0
(-oo:0)(0:+oo)x-+
((64*x^8)/27)*y^-4 = 0
((64*x^8)/27)*y^-4 = 0
64/27*x^8*y^-4 = 0 // : 64/27*y^-4
x^8 = 0
x = 0
x in (0:+oo)
(((64*x^8)/27)*y^-4)^(-3/4) = 0
(64/27)^(-3/4)*x^-6*y^3 = 0 // : (64/27)^(-3/4)*y^3
x^-6 = 0
x naleu017Cy do O
x belongs to the empty set
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