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int(x^2+2)/(x^4+4)dx is equal to (a) 1/...

`int(x^2+2)/(x^4+4)dx` is equal to
(a) `1/2tan^(-1)((x^2-2)/(2x))+c`
(b) `1/2tan^(-1)((2x)/(x^2+2))+c`
(c)`1/2tan^(-1)((2x)/(x^2-2))+c`
(d)`1/2tan^(-1)(x^2+2)+c`

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