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D( x )
x = 0
36*x^-2 = 0
x = 0
x = 0
36*x^-2 = 0
36*x^-2 = 0
36*x^-2 = 0 // : 36
x^-2 = 0
x naleu017Cy do O
x in (-oo:0) U (0:+oo)
((36*x^-2)^-1)/2 = 0
1/72*x^2 = 0 // : 1/72
x^2 = 0
x = 0
x in { 0}
x belongs to the empty set
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