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D( x )
(X^2+3)*(X^2+3) = 0
(X^2+3)*(X^2+3) = 0
(X^2+3)*(X^2+3) = 0
(X^2+3)^2 = 0
x in (-oo:+oo)
(X^2+2*x+3)/((X^2+3)*(X^2+3)) = 0
(X^2+2*x+3)/((X^2+3)^2) = 0
X^2+2*x+3 = 0 // - X^2+3
2*x = -(X^2+3) // : 2
x = (-(X^2+3))/2
x = (-(X^2+3))/2
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