LON-CAPA P23.problem

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Question 23

If $f(x) = x^2 - 1$ and $g(x) = \sqrt{x} + 1$ , then $(f \circ g)(x) =$

$x$
$|x|$
$x + 2\sqrt{x}$
$\sqrt{x^2 - 1} + 1$
None of the above

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