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D( x )
x = 0
(16*x^5)/x = 0
x = 0
x = 0
(16*x^5)/x = 0
(16*x^5)/x = 0
16*x^4 = 0 // : 16
x^4 = 0
x = 0
x in (-oo:0) U (0:+oo)
(((16*x^5)/x)^-1)/2 = 0
1/32*x^-4 = 0 // : 1/32
x^-4 = 0
x należy do O
x belongs to the empty set
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