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D( x )
16*x^3*y^8 < 0
x = 0
16*x^3*y^8 < 0
16*x^3*y^8 < 0
16*x^3*y^8 = 0
16*x^3*y^8 = 0 // : 16*y^8
x^3 = 0
x = 0
x < 0
(-oo:0)(0:+oo)x-+
x = 0
x = 0
x in (0:+oo)
(8*x^-2*y^-3)^(1/3)*(16*x^3*y^8)^(1/4) = 0
4*x^(1/12)*y = 0 // : 4*y
x^(1/12) = 0
x = 0
x in { 0}
x belongs to the empty set
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