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D( x )
48*x^12 = 0
48*x^12 = 0
48*x^12 = 0
48*x^12 = 0 // : 48
x^12 = 0
x = 0
x in (-oo:0) U (0:+oo)
(9*32*x^4*x^6)/(48*x^12) = 0
6*x^-2 = 0 // : 6
x^-2 = 0
x należy do O
x belongs to the empty set
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