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D( x )
x < 0
x = 0
x < 0
x = 0
x = 0
x in (0:+oo)
2*x^(-1/2) = (4*7^(1/2)-4)/6 // - (4*7^(1/2)-4)/6
2*x^(-1/2)-((4*7^(1/2)-4)/6) = 0
2*x^(-1/2) = (4*7^(1/2)-4)/6 // : 2
x^(-1/2) = (4*7^(1/2)-4)/12
-1/2 < 0
1/(x^(1/2)) = (4*7^(1/2)-4)/12 // * x^(1/2)
1 = ((4*7^(1/2)-4)/12)*x^(1/2) // : (4*7^(1/2)-4)/12
12*(4*7^(1/2)-4)^-1 = x^(1/2)
x^(1/2) = 12*(4*7^(1/2)-4)^-1 // ^ 2
x = 144*(4*7^(1/2)-4)^-2
x = 144*(4*7^(1/2)-4)^-2
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