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D( x )
(x^2+3)^4 = 0
(x^2+3)^4 = 0
(x^2+3)^4 = 0
1*x^2 = -3 // : 1
x^2 = -3
x in (-oo:+oo)
(2*x^2-6)/((x^2+3)^4) = 0
2*x^2 = 6 // : 2
x^2 = 3
x^2 = 3 // ^ 1/2
abs(x) = 3^(1/2)
x = 3^(1/2) or x = -3^(1/2)
x in { 3^(1/2), -3^(1/2) }
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