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D( q )
q = 0
q = 0
q = 0
q in (-oo:0) U (0:+oo)
2.5*q = 2/q // - 2/q
2.5*q-(2/q) = 0
2.5*q-2*q^-1 = 0
2.5*q-2*q^-1 = 0
q^-1*(2.5*q^2-2) = 0
2.5*q^2 = 2 // : 2.5
q^2 = 0.8
q^2 = 0.8 // ^ 1/2
abs(q) = 0.8^(1/2)
q = 0.8^(1/2) or q = -0.8^(1/2)
1/q = 0
1*q^-1 = 0 // : 1
q^-1 = 0
q naleu017Cy do O
q in { 0.8^(1/2), -0.8^(1/2) }
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