Let x be a real number such that sin(sin x) = 1/2 and 2 < x < 3. What's the value of cos(-sin x)?

The answer is relatively obvious but I cannot for the life of me figure out the need to restrict x to (2,3). The added information does not change what the answer would be if that restriction was not there...at least as far as I can tell.

If there is a reason, I would love to see it!

Thank you in advance.