Geometry

Question Analysis  

The main focus is recognizing that  and  are complementary angles () and using trigonometric identities to relate  to .  

 

Key Concept Explanation  

Complementary Angles: . For , .  

Pythagorean Identity:  for acute angles.  

 

Step-by-Step Solution  

1. Relate  to :  

2. Apply the Pythagorean identity to :  

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