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D( x )
x < 0
x < 0
x in <0:+oo)
Y = -9*x^(1/2) // + -9*x^(1/2)
Y-(-9*x^(1/2)) = 0
Y+9*x^(1/2) = 0
9*x^(1/2) = -Y // : 9
x^(1/2) = -Y/9
x^(1/2) = -Y/9 // ^ 2
x = (Y^2)/81
x = (Y^2)/81
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