Prove that if f (x) is a continuous function on an interval then so is the function

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Prove that if f (x) is a continuous function on an interval then so is the function |f (x)| = √(f (x))2.
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Calculus

ISBN: 978-0131429246

9th edition

Authors: Dale Varberg, Edwin J. Purcell, Steven E. Rigdon

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