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Cornelia is trying to solve the equation for x: arccos (cos x) = 4 . She reasons (incorrectly): Cosine and arccosine are inverse functions, so
Cornelia is trying to solve the equation for x: arccos (cos x) = 4 . She reasons (incorrectly): "Cosine and arccosine are inverse functions, so arccos (cos x) = x for all values of x. Therefore, the answer is x = 4 ." Explain what's wrong with Cornelia's reasoning, and find the correct answer to Cornelia's proble
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