Algebra-2

On the unit circle, the sign of the x- and y-coordinates determines the quadrant:  
x > 0 ,  y > 0 : First quadrant.  
x < 0 ,  y > 0 : Second quadrant.
x < 0 ,  y < 0 : Third quadrant.  
x > 0 ,  y < 0 : Fourth quadrant.  

1. Tangent () is positive when and have the same sign.
This occurs in the first and third quadrants.  

2. Secant () is positive when cosine (