Posted by Erica on Monday, December 6, 2010 at 2:06am.
Find f'(x) and solve for f'(x)=0.
If f'(x) has one or more extrema, i.e. where f"(x)≠0, then the function is not monotonic, and an inverse is undefined on its entire domain.
For the case of f(x)=cos(x), there should be an infinite number of extrema.
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