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D( x )
x < 0
x = 0
x < 0
x = 0
x = 0
x in (0:+oo)
x^(-3/2) = 1/4 // - 1/4
x^(-3/2)-(1/4) = 0
x^(-3/2)-1/4 = 0
1*x^(-3/2) = 1/4 // : 1
x^(-3/2) = 1/4
-3/2 < 0
1/(x^(3/2)) = 1/4 // * x^(3/2)
1 = 1/4*x^(3/2) // : 1/4
4 = x^(3/2)
x^(3/2) = 4 // ^ 2
x^3 = 16 // ^ 1/3
x = 2*2^(1/3)
x = 2*2^(1/3)
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