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D( x )
x < 0
x = 0
x < 0
x = 0
x = 0
x in (0:+oo)
x^(-1/4) = 8 // - 8
x^(-1/4)-8 = 0
1*x^(-1/4) = 8 // : 1
x^(-1/4) = 8
-1/4 < 0
1/(x^(1/4)) = 8 // * x^(1/4)
1 = 8*x^(1/4) // : 8
1/8 = x^(1/4)
x^(1/4) = 1/8 // ^ 4
x = 1/4096
x = 1/4096
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