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D( a )
a = 0
a = 0
a = 0
a in (-oo:0) U (0:+oo)
1/a-((3/13)*a) = 0
(-3/13)*a+1/a = 0
1*a^-1-3/13*a^1 = 0
(1*a^0-3/13*a^2)/(a^1) = 0 // * a^2
a^1*(1*a^0-3/13*a^2) = 0
a^1
(-3/13)*a^2+1 = 0
(-3/13)*a^2+1 = 0
DELTA = 0^2-(1*4*(-3/13))
DELTA = 12/13
DELTA > 0
a = ((12/13)^(1/2)+0)/(2*(-3/13)) or a = (0-(12/13)^(1/2))/(2*(-3/13))
a = -13/6*(12/13)^(1/2) or a = 13/6*(12/13)^(1/2)
a in { -13/6*(12/13)^(1/2), 13/6*(12/13)^(1/2)}
a in { -13/6*(12/13)^(1/2), 13/6*(12/13)^(1/2) }
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