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D( a )
a = 0
a = 0
a = 0
a in (-oo:0) U (0:+oo)
6*a-(36/a)-6 = 0
6*a-36*a^-1-6 = 0
6*a^1-36*a^-1-6*a^0 = 0
(6*a^2-6*a^1-36*a^0)/(a^1) = 0 // * a^2
a^1*(6*a^2-6*a^1-36*a^0) = 0
a^1
6*a^2-6*a-36 = 0
6*a^2-6*a-36 = 0
DELTA = (-6)^2-(-36*4*6)
DELTA = 900
DELTA > 0
a = (900^(1/2)+6)/(2*6) or a = (6-900^(1/2))/(2*6)
a = 3 or a = -2
a in { -2, 3}
a in { -2, 3 }
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