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D( x )
(15*x^6)/5 = 0
(15*x^6)/5 = 0
(15*x^6)/5 = 0
3*x^6 = 0 // : 3
x^6 = 0
x = 0
x in (-oo:0) U (0:+oo)
(5*x^2)/((15*x^6)/5) = 0
5/3*x^-4 = 0 // : 5/3
x^-4 = 0
x należy do O
x belongs to the empty set
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