Geometry

Question Analysis  

The main focus is using the co-function identity to relate  to  of its complementary angle for , which is an obtuse angle in QII.  

 

Key Concept Explanation  

Co-function identity:  for acute . For obtuse , first find the reference angle , then apply  (QII cosine is negative) and use the co-function identity on .  

 

Step-by-Step Solution  

1. Find the reference angle for :  

Thus, .  

2. Apply the co-function identity to :  

3. Simplify the complementary angle:  

Convert  to twenty-sixths: ,

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