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D( x )
(0.01*x^2+1)^2 = 0
(0.01*x^2+1)^2 = 0
(0.01*x^2+1)^2 = 0
0.01*x^2 = -1 // : 0.01
x^2 = -100
x in (-oo:+oo)
-x/((0.01*x^2+1)^2) = 0
-1*x = 0 // : -1
x = 0
x = 0
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