Geometry

Question Analysis  

The main focus is to determine which quadrant has both positive sine () and cosine () values by recalling the sign conventions for trigonometric functions in each quadrant.  

Key Concept Explanation  

In the unit circle, the signs of  and  depend on the quadrant:  

QI: x > 0, y > 0 →  > 0,  > 0.  

QII: x < 0, y > 0 →  < 0,  > 0.  

QIII: x < 0, y < 0 →