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D( x )
x < 0
x = 0
x < 0
x = 0
x = 0
x in (0:+oo)
x^(-1/2) = -3/5000 // + -3/5000
x^(-1/2)-(-3/5000) = 0
x^(-1/2)+3/5000 = 0
1*x^(-1/2) = -3/5000 // : 1
x^(-1/2) = -3/5000
-1/2 < 0
1/(x^(1/2)) = -3/5000 // * x^(1/2)
1 = -3/5000*x^(1/2) // : -3/5000
-5000/3 = x^(1/2)
x^(1/2) = -5000/3 // ^ 2
x = 25000000/9
x = 25000000/9
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