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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
x^(2-5) = 1/16 // - 1/16
x^(2-5)-(1/16) = 0
x^(2-5)-1/16 = 0
1*x^-3 = 1/16 // : 1
x^-3 = 1/16
-3 < 0
1/(x^3) = 1/16 // * x^3
1 = 1/16*x^3 // : 1/16
16 = x^3
x^3 = 16 // ^ 1/3
x = 2*2^(1/3)
x = 2*2^(1/3)
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