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D( x )
x = 0
-27*x^-6 = 0
x = 0
x = 0
-27*x^-6 = 0
-27*x^-6 = 0
-27*x^-6 = 0 // : -27
x^-6 = 0
x naleu017Cy do O
x in (-oo:0) U (0:+oo)
1/(-27*x^-6) = 0
-1/27*x^6 = 0 // : -1/27
x^6 = 0
x = 0
x in { 0}
x belongs to the empty set
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