Geometry

Question Analysis  

The main focus is using the co-function identity to express  as  of its complementary angle for .  

 

Key Concept Explanation  

Co-function identity: . The cosine of an angle equals the sine of its complementary angle .  

 

Step-by-Step Solution  

1. Apply the co-function identity:  

2. Simplify the expression:  

Convert  to twenty-seconds: , .  

Thus,