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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
x^(-3/5) = 1/8 // - 1/8
x^(-3/5)-(1/8) = 0
x^(-3/5)-1/8 = 0
1*x^(-3/5) = 1/8 // : 1
x^(-3/5) = 1/8
-3/5 < 0
1/(x^(3/5)) = 1/8 // * x^(3/5)
1 = 1/8*x^(3/5) // : 1/8
8 = x^(3/5)
x^(3/5) = 8 // ^ 5
x^3 = 32768 // ^ 1/3
x = 32
x = 32
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