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