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D( a )
a^2 = 0
a = 0
a^2 = 0
a^2 = 0
1*a^2 = 0 // : 1
a^2 = 0
a = 0
a = 0
a = 0
a in (-oo:0) U (0:+oo)
12/(a^2) = 1-(1/a) // - 1-(1/a)
1/a+12/(a^2)-1 = 0
a^-1+12*a^-2-1 = 0
t_1 = a^-1
12*t_1^2+1*t_1^1-1 = 0
12*t_1^2+t_1-1 = 0
DELTA = 1^2-(-1*4*12)
DELTA = 49
DELTA > 0
t_1 = (49^(1/2)-1)/(2*12) or t_1 = (-49^(1/2)-1)/(2*12)
t_1 = 1/4 or t_1 = -1/3
t_1 = -1/3
a^-1+1/3 = 0
1*a^-1 = -1/3 // : 1
a^-1 = -1/3
-1 < 0
1/(a^1) = -1/3 // * a^1
1 = -1/3*a^1 // : -1/3
-3 = a^1
a = -3
t_1 = 1/4
a^-1-1/4 = 0
1*a^-1 = 1/4 // : 1
a^-1 = 1/4
-1 < 0
1/(a^1) = 1/4 // * a^1
1 = 1/4*a^1 // : 1/4
4 = a^1
a = 4
a in { -3, 4 }
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