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D( x )
4*x = 0
4*x = 0
4*x = 0
4*x = 0 // : 4
x = 0
x in (-oo:0) U (0:+oo)
(192*x^2-x^4)/(4*x) = 0
192*x^2-x^4 = 0
x^2*(192-x^2) = 0
-1*x^2 = -192 // : -1
x^2 = 192
x^2 = 192 // ^ 1/2
abs(x) = 8*3^(1/2)
x = 8*3^(1/2) or x = -(8*3^(1/2))
x^2*(x-8*3^(1/2))*(x+8*3^(1/2)) = 0
(x^2*(x-8*3^(1/2))*(x+8*3^(1/2)))/(4*x) = 0
( x+8*3^(1/2) )
x+8*3^(1/2) = 0 // - 8*3^(1/2)
x = -(8*3^(1/2))
x = -8*3^(1/2)
( x-8*3^(1/2) )
x-8*3^(1/2) = 0 // + -8*3^(1/2)
x = -(-8*3^(1/2))
x = 8*3^(1/2)
( x^2 )
1*x^2 = 0 // : 1
x^2 = 0
x = 0
x in { 0}
x in { -8*3^(1/2), 8*3^(1/2) }
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