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Question
Use the function f and the given real number a to find (f^-1)(a). (Hint: See Example 5. If an answer does not exist, enter DNE.) f(x)=\cos (6 x), \quad 0
\leq x \leq \pi / 6, a=1 \mleft(f^{-1}\mright)^{\prime}(1)=?
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