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[" 27."int e^(tan^(-1)x)(1+x+x^(2))d(cot...

[" 27."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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