### Home > PC > Chapter 6 > Lesson 6.1.2 > Problem 6-30

6-30.

If sin

*θ*=

*θ*≤

*π*, find cos

*θ*. You will need a unit circle diagram or a sketch of the graph of

*y*= sin

*x*, in addition to the Fundamental Pythagorean Identity, to help you answer this. Homework Help ✎

Draw a triangle diagram and label known sides.

Determine the length of the missing side.

Evaluate cos(*θ*). What sign should be used?