Geometry

Question Analysis  

The main focus is to use the co-function identity for complementary angles to express in terms of sine.  

Key Concept Explanation  

Complementary Angles: Two angles are complementary if their sum is . The co-function identity states . This applies directly to acute angles like .  

Step-by-Step Solution  

1. Find the complementary angle:  

Subtract from :  

2. Apply the co-function identity:  

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