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D( x )
x < 0
x^(1/2) = 0
x < 0
x^(1/2) = 0
x^(1/2) = 0
1*x^(1/2) = 0 // : 1
x^(1/2) = 0
x = 0
x in (0:+oo)
36 = 18/(x^(1/2)) // - 18/(x^(1/2))
36-(18/(x^(1/2))) = 0
36-18*x^(-(1/2)) = 0
-18*x^(-1/2) = -36 // : -18
x^(-1/2) = 2
-1/2 < 0
1/(x^(1/2)) = 2 // * x^(1/2)
1 = 2*x^(1/2) // : 2
1/2 = x^(1/2)
x^(1/2) = 1/2 // ^ 2
x = 1/4
x = 1/4
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