For how many values of in the interval is ? A. B. C. D. E.
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How many values will lie in the region ?
Originally Posted by Prove It where .
How many values will lie in the region ? Technically, the second line should read where
since is a function.
Actually some textbooks use "arccos" (and "arcsin") to include all solutions (so they are NOT functions) and "Arccos" (and "Arcsin") for the functions.
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