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D( x )
(x^2+208)^0.5 = 0
x^2+208 < 0
(x^2+208)^0.5 = 0
(x^2+208)^0.5 = 0
1*x^2 = -208 // : 1
x^2 = -208
x^2+208 < 0
x^2+208 < 0
1*x^2 < -208
1*x^2 < -208 // : 1
x^2 < -208/1
x^2 < -208
x belongs to the empty set
x in (-oo:+oo)
(3*x+8)/((x^2+208)^0.5) = 0
3*x+8 = 0 // - 8
3*x = -8 // : 3
x = -8/3
x = -8/3
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