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D( x )
((12*x^4*y^1)/6)*z^3 = 0
((12*x^4*y^1)/6)*z^3 = 0
((12*x^4*y^1)/6)*z^3 = 0
((12*x^4*y)/6)*z^3 = 0
2*x^4*y*z^3 = 0 // : 2*y*z^3
x^4 = 0
x = 0
x in (-oo:0) U (0:+oo)
(((12*x^4*y^1)/6)*z^3)^0 = 0
1 = 0
(((12*x^4*y^1)/6)*z^3)^0 = 0
1 = 0
x belongs to the empty set
x belongs to the empty set
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