`int_(0)^(1) (1)/(1+x+2x^(2))dx`

1.	`int_(0)^(1) (1)/(1+x+2x^(2))dx`
Answer» Correct Answer - `(2)/(sqrt(7))[tan^(-1) (5)/(sqrt(7)) -tan^(-1) .(1)/(sqrt(7))]`

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