Chapter 6 - The Circular Functions and Their Graphs - Chapter 6 Test Prep - Review Exercises - Page 645: 39

$$0.9703$$

$$\eqalign{ & \cos \left( { - 0.2443} \right) \cr & {\text{Recall that }}\cos \left( { - \theta } \right) = \cos \theta \cr & = \cos \left( {0.2443} \right) \cr & {\text{Using a calculator into radian mode we obtain}} \cr & \cos \left( {0.2443} \right) \approx 0.9703 \cr} $$