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 .  

Step-by-Step Solution  

1. Calculate the complementary angle:  

.  

2. Apply the co-function identity:  

.  

Common Mistakes  

Using  instead of  for the complementary angle (e.g.,

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