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D( a )
a = 0
a = 0
a = 0
a in (-oo:0) U (0:+oo)
2/a-a = 0
2*a^-1-1*a^1 = 0
(2*a^0-1*a^2)/(a^1) = 0 // * a^2
a^1*(2*a^0-1*a^2) = 0
a^1
2-a^2 = 0
2-a^2 = 0
DELTA = 0^2-(-1*2*4)
DELTA = 8
DELTA > 0
a = (8^(1/2)+0)/(-1*2) or a = (0-8^(1/2))/(-1*2)
a = -2^(1/2) or a = 2^(1/2)
a in { -2^(1/2), 2^(1/2)}
a in { -2^(1/2), 2^(1/2) }
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