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D( x )
x < 0
x < 0
x in <0:+oo)
x^(1/2) = 30 // - 30
x^(1/2)-30 = 0
1*x^(1/2) = 30 // : 1
x^(1/2) = 30
x^(1/2) = 30 // ^ 2
x = 900
x = 900
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