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int e^(tan^(-1)x)(1+x+x^2)d(cot^(-1)x) i...

`int e^(tan^(-1)x)(1+x+x^2)d(cot^(-1)x)` is equal to (a) `-e^(tan^(-1)x)+c` (b) `e^(tan^(-1)x)+c` (c) `-xe^(tan^(-1)x)+c` (d) `xe^(tan^(-1)x)+c`

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