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D( x )
x^2 = 0
x^2 = 0
x^2 = 0
1*x^2 = 0 // : 1
x^2 = 0
x = 0
x in (-oo:0) U (0:+oo)
x^5-(1/(x^2)) = 0
x^5-x^-2 = 0
x^5-x^-2 = 0
x^-2*(x^7-1) = 0
1*x^7 = 1 // : 1
x^7 = 1
x^7 = 1 // ^ 1/7
x = 1
1/(x^2) = 0
1*x^-2 = 0 // : 1
x^-2 = 0
x należy do O
x = 1
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