# Chapter 5 - Review Exercises - Page 248: 26

26 is matched with B. $$\cos(-55^\circ)=\cos55^\circ$$

#### Work Step by Step

$$\cos(-55^\circ)$$ - Negative Angle Identities: $\cos(-\theta)=\cos\theta$ Therefore, $\cos(-55^\circ)=\cos55^\circ$ This corresponds to choice B. So we match 26 with B.

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