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D( x )
x^4+49 = 0
x^4+49 = 0
x^4+49 = 0
1*x^4 = -49 // : 1
x^4 = -49
x in (-oo:+oo)
(14*x^2)/(x^4+49) = 0
14*x^2 = 0 // : 14
x^2 = 0
x = 0
x = 0
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