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D( x )
0.25-x^2 = 0
0.25-x^2 = 0
0.25-x^2 = 0
-1*x^2 = -0.25 // : -1
x^2 = 0.25
x^2 = 0.25 // ^ 1/2
abs(x) = 0.25^(1/2)
x = 0.25^(1/2) or x = -0.25^(1/2)
x in (-oo:-0.25^(1/2)) U (-0.25^(1/2):0.25^(1/2)) U (0.25^(1/2):+oo)
((x^2)/(0.25-x^2))*(0.25-x) = 0
(x^2*(0.25-x))/(0.25-x^2) = 0
( 0.25-x )
0.25-x = 0 // - 0.25
-x = -0.25 // * -1
x = 0.25
( x^2 )
1*x^2 = 0 // : 1
x^2 = 0
x = 0
x in { 0.25, 0 }
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