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D( a )
-a = 0
a = 0
-a = 0
a = 0
a = 0
a = 0
a in (-oo:0) U (0:+oo)
1/(-a) = -(1/a) // + 1/a
1/(-a)+1/a = 0
0 = 0
a naleu017Cy do R
a in (-oo:0) U (0:+oo)
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