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(i) int((x^(2) - 1)/(x^(2) + 1))dx , (ii...

(i) `int((x^(2) - 1)/(x^(2) + 1))dx` , (ii) `int ((x^(6)- 1)/(x^(2) + 1))dx`
(iii) `int ((x^(4))/(1+x^(2)))dx` , (iv) `int((x^(2))/(1+x^(2)))dx`

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