### Home > PC3 > Chapter 3 > Lesson 3.1.1 > Problem 3-14

3-14.

State all values of

Draw a unit circle. In which quadrants is sine negative?

1. What special reference angle is this value related to?

2. In which quadrants is cosine positive?

Since sine is related to the

-value of the coordinates of the unit circle, where on the unit circle is?