Geometry

Question Analysis  

The main focus is using the relationship between sine and cosine of complementary angles in a right triangle.  

 

Key Concept Explanation  

Complementary Angles in Right Triangles: In a right triangle, the two acute angles are complementary (). Thus,  and .  

 

Step-by-Step Solution  

1. Identify the complementary angle:  

The complementary angle of  is .  

2. Apply the co-function identity:  

By definition, .  

3. Substitute the given value:  

Since , it follows that

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