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