Question: In Problems 1524, find rhe values of x R for which the given functions are both defined and continuous. 15. f(x) x2 +4 17.

In Problems 1524, find rhe values of x R for which the given functions are both defined and continuous. 15. f(x) x2 +4 17. f(x) 18. f(x) = cos(2r)
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