Geometry

Question Analysis  

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

 

Key Concept Explanation  

Pythagorean identity:  connects sine and cosine values.  

Quadrant signs: In QII, > 0 (given) and < 0 (to be applied).  

 

Step-by-Step Solution  

1. Substitute  into the identity:  

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