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Topic: trig question
Replies: 9   Last Post: Mar 11, 2006 2:28 PM

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Rob Morewood

Posts: 171
Registered: 12/6/04
Re: trig question
Posted: Mar 11, 2006 2:28 PM
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jennifer asked for a hint about:
> f(x) = cos x + x
> Find f^-1(1) = ?

and suggested:
> I have to find f inverse

I think you have been distracted by a harder problem.
This f inverse is not a nice function.
Don't waste time looking for a formula for f^(-1)(x).

Instead, concentrate on the meaning of f^(-1)(1).
[That ONE is significant, you are not asked for
f^(-1)(x), just f^(-1)(1). The former is very
hard, the latter is easy - even "guess and test"?]

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