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D( x )
12*x^4 = 0
12*x^4 = 0
12*x^4 = 0
12*x^4 = 0 // : 12
x^4 = 0
x = 0
x in (-oo:0) U (0:+oo)
((4*x^9)/(12*x^4))^3 = 0
1/27*x^15 = 0 // : 1/27
x^15 = 0
x = 0
x in { 0}
x belongs to the empty set
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