Chapter 13, Trigonometric Ratios and Functions - 13.2 Define General Angles and Use Radian Measure - 13.2 Exercises - Skill Practice - Page 863: 39

$0.5$

We know that we convert degrees into radians as follows: 1. Set the calculator in radian mode. 2. We need to click COS. 3. Then click the argument $\dfrac{\pi}{3}$. 4. Now click the ENTER Button. Thus, we get the answer $0.5$.