Chapter 1 - Trigonometric Functions - Section 1.3 Trigonometric Functions - 1.3 Exercises - Page 26: 35

positive

1. Let's consider quadrants and sign of (x,y) coordinates $quadrant (x,y):$ $Quad I $ $(+,+)$ $Quad II $ $(-,+)$ $Quad III$ $(-,-)$ $Quad IV$ $ (+,-)$ 2.In Q3 y is negative and x is negative , so $\frac{y}{x}$ is positive