Geometry

Question Analysis  

The main focus is to use the Pythagorean identity  to find  when  and  is in Quadrant IV, where  is positive.  

 

Key Concept Explanation  

Pythagorean identity: For any angle , .  

Quadrant signs: In QIV, < 0 and > 0.  

 

Step-by-Step Solution  

1. Apply the Pythagorean identity:  

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