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D( a )
a = 0
a = 0
a = 0
a in (-oo:0) U (0:+oo)
(5/2)*a = 2/a-(1/12) // - 2/a-(1/12)
(5/2)*a-(2/a)+1/12 = 0
(5/2)*a-2*a^-1+1/12 = 0
5/2*a^1-2*a^-1+1/12*a^0 = 0
(5/2*a^2+1/12*a^1-2*a^0)/(a^1) = 0 // * a^2
a^1*(5/2*a^2+1/12*a^1-2*a^0) = 0
a^1
(5/2)*a^2+(1/12)*a-2 = 0
(5/2)*a^2+(1/12)*a-2 = 0
DELTA = (1/12)^2-(-2*4*(5/2))
DELTA = 2881/144
DELTA > 0
a = ((2881/144)^(1/2)-(1/12))/(2*(5/2)) or a = (-(1/12)-(2881/144)^(1/2))/(2*(5/2))
a = ((2881/144)^(1/2)-1/12)/5 or a = (-((2881/144)^(1/2)+1/12))/5
a in { (-((2881/144)^(1/2)+1/12))/5, ((2881/144)^(1/2)-1/12)/5}
a in { (-((2881/144)^(1/2)+1/12))/5, ((2881/144)^(1/2)-1/12)/5 }
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