1.

Find the domain of the function `f(x)`defined by `f(x)=sqrt(4-x)+1/(sqrt(x^2-1))`.A. `(-oo,-1)uu(1,4]`B. `(-oo,-1]uu(1,4]`C. `(-oo,-1)uu[1,4]`D. `(-oo,-1)uu[1,4)`

Answer» Correct Answer - A
We have, `f(x)=sqrt(4-x)+(1)/(sqrt(x^(2)-1))`
f(x) is defined, if `4-xge0orx^(2)-1gt0`
`x-4le0 or (x-1)(x-1)gt0`
`xle4 or xlt-1 and xgt1`
`:.` Domain of `f=(-oo,-1)uu(1,4]`


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