### Home > PC3 > Chapter 2 > Lesson 2.2.4 > Problem 2-105

2-105.

Sketch a unit circle. In your circle, sketch an angle between

A positive cosine and a negative sine.

A sine of

. A negative cosine and a negative sine.

A cosine of about

and a sine of about . Can an angle have a sine equal to

and cosine equal to ? Give an angle or explain why not. Does

?