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D( i )
i = 0
i = 0
i = 0
i in (-oo:0) U (0:+oo)
9/10 = 36/i // - 36/i
9/10-(36/i) = 0
9/10-36*i^-1 = 0
-36*i^-1 = -9/10 // : -36
i^-1 = 1/40
-1 < 0
1/(i^1) = 1/40 // * i^1
1 = 1/40*i^1 // : 1/40
40 = i^1
i = 40
i = 40
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