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D( q )
q^(1/2) = 0
q < 0
q^(1/2) = 0
q^(1/2) = 0
1*q^(1/2) = 0 // : 1
q^(1/2) = 0
q = 0
q < 0
q in (0:+oo)
(2*q^2)/(q^(1/2)) = 0
2*q^(3/2) = 0 // : 2
q^(3/2) = 0
q = 0
q in { 0}
q belongs to the empty set
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