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math

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questions involving domain and range...

1. Find the domain of the function
f(x)=(3x+1)/(sqrt of (x^2+x-2))

andd.

2. Let f(x)= (absvalue(x))/x.
Show that f(x)={ 1, x > 0
{-1, x < 0
Find the domain and range of f(x).

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