Geometry

Question Analysis  

Calculate using the unit circle coordinates , focusing on reciprocal trigonometric identities.  

 

Key Concept Explanation  

Secant Definition: .  

On the unit circle, -coordinate. For , .  

 

Step-by-Step Solution  

1. Identify :  

.  

2. Apply the secant formula:  

.  

 

Common Mistakes  

Forgetting that