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D( a )
a = 0
a = 0
a = 0
a in (-oo:0) U (0:+oo)
6/a = a/6 // - a/6
6/a-(a/6) = 0
6*a^-1-1/6*a^1 = 0
(6*a^0-1/6*a^2)/(a^1) = 0 // * a^2
a^1*(6*a^0-1/6*a^2) = 0
a^1
(-1/6)*a^2+6 = 0
(-1/6)*a^2+6 = 0
DELTA = 0^2-(4*6*(-1/6))
DELTA = 4
DELTA > 0
a = (4^(1/2)+0)/(2*(-1/6)) or a = (0-4^(1/2))/(2*(-1/6))
a = -6 or a = 6
a in { -6, 6}
a in { -6, 6 }
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