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D( a )
8*a^2-8 = 0
8*a^2-8 = 0
8*a^2-8 = 0
8*a^2 = 8 // : 8
a^2 = 1
a^2 = 1 // ^ 1/2
abs(a) = 1
a = 1 or a = -1
a in (-oo:-1) U (-1:1) U (1:+oo)
(48*a^4-(16*a^2)-32)/(8*a^2-8) = 0
(48*a^4-16*a^2-32)/(8*a^2-8) = 0
48*a^4-16*a^2-32 = 0
16*(3*a^4-a^2-2) = 0
3*a^4-a^2-2 = 0
{ 1, -1, 2, -2 }
1
a = 1
3*a^4-a^2-2 = 0
1
a-1
3*a^3+3*a^2+2*a+2
3*a^4-a^2-2
a-1
3*a^3-3*a^4
3*a^3-a^2-2
3*a^2-3*a^3
2*a^2-2
2*a-2*a^2
2*a-2
2-2*a
0
3*a^3+3*a^2+2*a+2 = 0
{ 1, -1, 2, -2 }
1
a = 1
3*a^3+3*a^2+2*a+2 = 10
1
-1
a = -1
3*a^3+3*a^2+2*a+2 = 0
-1
a+1
3*a^2+2
3*a^3+3*a^2+2*a+2
a+1
-3*a^3-3*a^2
2*a+2
-2*a-2
0
3*a^2+2 = 0
DELTA = 0^2-(2*3*4)
DELTA = -24
DELTA < 0
a in { 1, -1}
16*(a-1)*(a+1) = 0
(16*(a-1)*(a+1))/(8*a^2-8) = 0
( 16 )
16 = 0
a belongs to the empty set
( a+1 )
a+1 = 0 // - 1
a = -1
( a-1 )
a-1 = 0 // + 1
a = 1
a in { -1}
a in { 1}
a belongs to the empty set
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