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D( i )
i = 0
i = 0
i = 0
i in (-oo:0) U (0:+oo)
14-((1^6)/i) = 0
14-i^-1 = 0
-1*i^-1 = -14 // : -1
i^-1 = 14
-1 < 0
1/(i^1) = 14 // * i^1
1 = 14*i^1 // : 14
1/14 = i^1
i = 1/14
i = 1/14
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