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D( x )
16*x^4*y^12 < 0
16*x^4*y^12 < 0
16*x^4*y^12 < 0
16*x^4*y^12 = 0
16*x^4*y^12 = 0 // : 16*y^12
x^4 = 0
x = 0
x < 0
(-oo:0) (0:+oo) x - +
x in <0:+oo)
(16*x^4*y^12)^(3/4) = 0
8*x^3*y^9 = 0 // : 8*y^9
x^3 = 0
x = 0
x = 0
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