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D( x )
x < 0
x = 0
x < 0
x = 0
x = 0
x in (0:+oo)
x^(-1/4) = 0.2 // - 0.2
x^(-1/4)-0.2 = 0
1*x^(-1/4) = 0.2 // : 1
x^(-1/4) = 0.2
-1/4 < 0
1/(x^(1/4)) = 0.2 // * x^(1/4)
1 = 0.2*x^(1/4) // : 0.2
5 = x^(1/4)
x^(1/4) = 5 // ^ 4
x = 625
x = 625
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