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D( a )
3*a^3 = 0
3*a^3 = 0
3*a^3 = 0
3*a^3 = 0 // : 3
a^3 = 0
a = 0
a in (-oo:0) U (0:+oo)
(3*a)/(3*a^3)-(2*a^2) = 0
(3*a)/(3*a^3)-2*a^2 = 0
a^-2-2*a^2 = 0
t_1 = a^2
1*t_1^-1-2*t_1^1 = 0
1*t_1^-1-2*t_1^1 = 0
(1*t_1^0-2*t_1^2)/(t_1^1) = 0 // * t_1^2
t_1^1*(1*t_1^0-2*t_1^2) = 0
t_1^1
1-2*t_1^2 = 0
1-2*t_1^2 = 0
DELTA = 0^2-(-2*1*4)
DELTA = 8
DELTA > 0
t_1 = (8^(1/2)+0)/(-2*2) or t_1 = (0-8^(1/2))/(-2*2)
t_1 = (-2^(1/2))/2 or t_1 = (2^(1/2))/2
t_1 in { (-2^(1/2))/2, (2^(1/2))/2}
t_1 = (-2^(1/2))/2
a^2-((-2^(1/2))/2) = 0
1*a^2 = (-2^(1/2))/2 // : 1
a^2 = (-2^(1/2))/2
t_1 = (2^(1/2))/2
a^2-((2^(1/2))/2) = 0
1*a^2 = (2^(1/2))/2 // : 1
a^2 = (2^(1/2))/2
a^2 = (2^(1/2))/2 // ^ 1/2
abs(a) = 2^(-1/4)
a = 2^(-1/4) or a = -2^(-1/4)
a in { 2^(-1/4), -2^(-1/4) }
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