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D( x )
x^12*y^8 < 0
x^12*y^8 < 0
x^12*y^8 < 0
x^12*y^8 = 0
x^12*y^8 = 0 // : y^8
x^12 = 0
x = 0
x < 0
(-oo:0)(0:+oo)x-+
x in <0:+oo)
(x^12*y^8)^(1/4) = 0
x^3*y^2 = 0 // : y^2
x^3 = 0
x = 0
x = 0
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