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D( x )
(4*x)^2 = 0
-31*x = 0
(4*x)^2 = 0
(4*x)^2 = 0
16*x^2 = 0 // : 16
x^2 = 0
x = 0
-31*x = 0
-31*x = 0
-31*x = 0 // : -31
x = 0
x in (-oo:0) U (0:+oo)
((-31*x)^0)/((4*x)^2) = 0
1/((4*x)^2) = 0
1/16*x^-2 = 0 // : 1/16
x^-2 = 0
x naleu017Cy do O
x belongs to the empty set
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