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D( a )
a = 0
a = 0
a = 0
a in (-oo:0) U (0:+oo)
(2*a-(1/a))^2 = 0
(2*a-a^-1)^2 = 0
2*a-a^-1 = 0
a^-1*(2*a^2-1) = 0
2*a^2 = 1 // : 2
a^2 = 1/2
a^2 = 1/2 // ^ 1/2
abs(a) = (1/2)^(1/2)
a = (1/2)^(1/2) or a = -(1/2)^(1/2)
a^-1*(a-(1/2)^(1/2))*(a+(1/2)^(1/2)) = 0
(a^-1)^2*(a-(1/2)^(1/2))^2*(a+(1/2)^(1/2))^2 = 0
( a+(1/2)^(1/2) )
a+(1/2)^(1/2) = 0 // - (1/2)^(1/2)
a = -(1/2)^(1/2)
( a-(1/2)^(1/2) )
a-(1/2)^(1/2) = 0 // + (1/2)^(1/2)
a = (1/2)^(1/2)
( a^-1 )
1*a^-1 = 0 // : 1
a^-1 = 0
a należy do O
a in { -(1/2)^(1/2), -(1/2)^(1/2), (1/2)^(1/2), (1/2)^(1/2) }
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