Geometry

Question Analysis  

Focus on why  and  coordinates are equal for  in Quadrant I, emphasizing triangle properties.  

Key Concept Explanation  

A  triangle is isosceles, meaning its two legs (adjacent and opposite sides) are equal.  

On the unit circle, this translates to equal  and  coordinates.  

Step-by-Step Solution  

1. In a  triangle:  

The two non-right angles are equal (), so their opposite sides (legs) are equal.  

Thus,

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