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