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D( x )
16*x^20 < 0
16*x^20 = 0
16*x^20 < 0
16*x^20 < 0
16*x^20 < 0
16*x^20 < 0 // : 16
x^20 < 0/16
x^20 < 0
x belongs to the empty set
16*x^20 = 0
16*x^20 = 0
16*x^20 = 0 // : 16
x^20 = 0
x = 0
x in (-oo:0) U (0:+oo)
(16*x^20)^(-1/4) = 0
1/2*x^-5 = 0 // : 1/2
x^-5 = 0
x należy do O
x belongs to the empty set
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