Geometry

Question Analysis  

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

 

Key Concept Explanation  

Pythagorean identity:  relates sine and cosine values.  

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

 

Step-by-Step Solution  

1. Substitute  into the identity:  

  

2. Solve for

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