### Home > PC > Chapter 4 > Lesson 4.2.3 > Problem 4-100

4-100.

Verify that cos *θ* + sin *θ* tan *θ* = sec *θ* by simplifying the left side and using the Fundamental Pythagorean Identity. Homework Help ✎

4. Simplifying using the Fundamental Pythagorean Identities.