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((16*x^4-(64*x^2))^1)/2 = 0
(16*x^4-64*x^2)/2 = 0
16*x^4-64*x^2 = 0
16*x^2*(x^2-4) = 0
1*x^2 = 4 // : 1
x^2 = 4
x^2 = 4 // ^ 1/2
abs(x) = 2
x = 2 or x = -2
16*x^2*(x-2)*(x+2) = 0
(16*x^2*(x-2)*(x+2))/2 = 0
( 16*x^2 )
16*x^2 = 0 // : 16
x^2 = 0
x = 0
( x+2 )
x+2 = 0 // - 2
x = -2
( x-2 )
x-2 = 0 // + 2
x = 2
x in { 0, -2, 2 }
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