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