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D( a )
a-4 = 0
a-4 = 0
a-4 = 0
a-4 = 0 // + 4
a = 4
a in (-oo:4) U (4:+oo)
((2*a^2-(8*a))^2)/(a-4) = 0
((2*a^2-8*a)^2)/(a-4) = 0
2*a^2-8*a = 0
2*a*(a-4) = 0
a-4 = 0 // + 4
a = 4
2*a*(a-4) = 0
(2*a)^2*(a-4) = 0
( 2*a )
2*a = 0 // : 2
a = 0
( a-4 )
a-4 = 0 // + 4
a = 4
a in { 4}
a in { 0, 0 }
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