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D( x )
1-(25*x^2) = 0
1-(25*x^2) = 0
1-(25*x^2) = 0
1-25*x^2 = 0
-25*x^2 = -1 // : -25
x^2 = 1/25
x^2 = 1/25 // ^ 1/2
abs(x) = 1/5
x = 1/5 or x = -1/5
x in (-oo:-1/5) U (-1/5:1/5) U (1/5:+oo)
(5*x-1)/(1-(25*x^2)) = 0
(5*x-1)/(1-25*x^2) = 0
5*x-1 = 0 // + 1
5*x = 1 // : 5
x = 1/5
x in { 1/5}
x belongs to the empty set
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