Answer:
correct answer is : To determine to measure of the unknown angle, be sure to use the total sum of 180°. If two angles are given, add them together and then subtract from 180°. If two angles are the same and unknown, subtract the known angle from 180° and then divide by 2.
Let

. Then

, and so as

, you have

. The limit is then equivalent to
When u keep dividing and dont get it go up by each number and keep divind by every number until u get it which would be