### Home > PC > Chapter 4 > Lesson 4.2.3 > Problem4-100

4-100.

Verify that $\text{cos }θ + \text{sin }θ \text{ tan }θ = \text{sec }θ$ by simplifying the left side and using the Fundamental Pythagorean Identity.

4. Simplifying using the Fundamental Pythagorean Identities.