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2 answers:
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First of all, we can just ignore A, it has no effect but to vertically stretch our cosine.
If it was only , the function would be invertible as long as it's confined between
and
. Now, the argument of our cosine is not
but
. It means that it won't stop at
, but at
.
Another way to think about it, "what should i replace x with so I get inside the cosine?"
We have that
<span>4 1/ 3
−1 1/3 </span>
the answer in the attached figure
<span>4 1/ 3
−1 1/3 </span>
the answer in the attached figure