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D( x )
x < 0
8*x^(1/2) <= 0
x < 0
8*x^(1/2) <= 0
8*x^(1/2) <= 0
8*x^(1/2) <= 0
8*x^(1/2) <= 0 // : 8
x^(1/2) <= 0/8
x^(1/2) <= 0
x >= 0
x in <0:0>
x in (0:+oo)
ln(8*x^(1/2)) = 0
ln(8*x^(1/2)) = ln(e^0)
8*x^(1/2) = e^0
8*x^(1/2)-e^0 = 0
8*x^(1/2) = 1 // : 8
x^(1/2) = 1/8
x^(1/2) = 1/8 // ^ 2
x = 1/64
x = 1/64
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