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D( x )
39*(x^2-1)^(4/3) = 0
39*(x^2-1)^(4/3) = 0
39*(x^2-1)^(4/3) = 0
( 39 )
39 = 0
x belongs to the empty set
( x^2-1 )
1*x^2 = 1 // : 1
x^2 = 1
x^2 = 1 // ^ 1/2
abs(x) = 1
x = 1 or x = -1
x in (-oo:-1) U (-1:1) U (1:+oo)
(16*x^2-48)/(39*(x^2-1)^(4/3)) = 0
16*x^2 = 48 // : 16
x^2 = 3
x^2 = 3 // ^ 1/2
abs(x) = 3^(1/2)
x = 3^(1/2) or x = -3^(1/2)
x in { 3^(1/2), -3^(1/2) }
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