### Home > A2C > Chapter 13 > Lesson 13.2.1 > Problem 13-103

13-103.

If *θ*. Use what you know about the Pythagorean Identity and the unit circle to get started. Homework Help ✎

Rewrite the Pythagorean Identity.

Are sine and cosine negative or positive?

13-103.

If *θ*. Use what you know about the Pythagorean Identity and the unit circle to get started. Homework Help ✎

Rewrite the Pythagorean Identity.

Are sine and cosine negative or positive?