Let f and g be real functions, defined by `f(x)=sqrt(x-1)andg(x)=sqrt(x+1)`. Find (i) `(f+g)(x)`

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Let f and g be real functions, defined by `f(x)=sqrt(x-1)andg(x)=sqrt(x+1)`. Find (i) `(f+g)(x)` (ii) `(f-g)(x)` (iii) `(fg)(x) `(iv) `((f)/(g))(x)`.
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