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D( x )
x = 0
4*x^4 = 0
x = 0
x = 0
4*x^4 = 0
4*x^4 = 0
4*x^4 = 0 // : 4
x^4 = 0
x = 0
x in (-oo:0) U (0:+oo)
(x^-1)/(4*x^4) = 0
1/4*x^-5 = 0 // : 1/4
x^-5 = 0
x należy do O
x belongs to the empty set
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