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D( x )
(x^8*y^-4)/(16*y^(4/3)) = 0
(x^8*y^-4)/(16*y^(4/3)) < 0
16*y^(4/3) = 0
(x^8*y^-4)/(16*y^(4/3)) = 0
(x^8*y^-4)/(16*y^(4/3)) = 0
1/16*x^8*y^(-16/3) = 0 // : 1/16*y^(-16/3)
x^8 = 0
x = 0
(x^8*y^-4)/(16*y^(4/3)) < 0
(x^8*y^-4)/(16*y^(4/3)) < 0
(x^8*y^-4)/(16*y^(4/3)) = 0
1/16*x^8*y^(-16/3) = 0 // : 1/16*y^(-16/3)
x^8 = 0
x = 0
x < 0
(-oo:0) (0:+oo) x - +
16*y^(4/3) = 0
16*y^(4/3) = 0
16*y^(4/3) = 0
x należy do R
x belongs to the empty set
((x^8*y^-4)/(16*y^(4/3)))^(-1/4) = 0
x belongs to the empty set
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