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D( x )
x < 0
x < 0
x in <0:+oo)
X-x^(1/2)-6 = 0
-1*x^(1/2) = -(X-6) // : -1
x^(1/2) = X-6
x^(1/2) = X-6 // ^ 2
x = (X-6)^2
x = (X-6)^2
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