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`x in R``x gt 0``x in [-1, 1]``x in (0,1]`

Answer :

DSolution :

`f(x) = tan^(-1) x + tan^(-1).(1)/(x) = {((pi)/(2),x gt 0),((-pi)/(2),x lt 0):}` <br> `g(x) = sin^(-1) x + cos^(-1) x = (pi)/(2) AA x in [-1, 1]` <br> Therefore, common domain is `x in (0, 1]`**Recall Trigonometric Functions**

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