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D( d )
d < 0
d = 0
d < 0
d = 0
d = 0
d in (0:+oo)
(d^2-d^0.1)/d = 0
d^2-d^0.1 = 0
d^0.1*(d^1.9-1) = 0
1*d^1.9 = 1 // : 1
d^1.9 = 1
d = 1^(1/0.9)
d^0.1*(d-1) = 0
(d^0.1*(d-1))/d = 0
( d-1 )
d-1 = 0 // + 1
d = 1
( d^0.1 )
1*d^0.1 = 0 // : 1
d^0.1 = 0
d = 0
d in { 0}
d = 1
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