For Exercises 3-10, write the product as a sum or difference. (See Example 1) 3x 6. cos-coS- 2 2

Trigonometry (11th Edition)
11th Edition
ISBN:9780134217437
Author:Margaret L. Lial, John Hornsby, David I. Schneider, Callie Daniels
Publisher:Margaret L. Lial, John Hornsby, David I. Schneider, Callie Daniels
Chapter1: Trigonometric Functions
Section: Chapter Questions
Problem 1RE: 1. Give the measures of the complement and the supplement of an angle measuring 35°.
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### Exercise Instructions: Trigonometric Identities

#### Section 5.4, Page 605, Exercises #6, 12, 20

**For Exercises 3–10**, write the product as a sum or difference. (Refer to Example 1)

**Exercise 6:**
\[ \cos \frac{x}{2} \cos \frac{3x}{2} \]

---

**In Exercises 11–14**, use a product-to-sum formula to find the exact value. (Refer to Example 2)

**Exercise 12:**
\[ \sin 82.5^\circ \cos 37.5^\circ \]

---

**For Exercises 19–22**, write each expression as a product. (Refer to Example 3)

**Exercise 20:**
\[ \sin 30^\circ + \sin 10 \theta \]
Transcribed Image Text:### Exercise Instructions: Trigonometric Identities #### Section 5.4, Page 605, Exercises #6, 12, 20 **For Exercises 3–10**, write the product as a sum or difference. (Refer to Example 1) **Exercise 6:** \[ \cos \frac{x}{2} \cos \frac{3x}{2} \] --- **In Exercises 11–14**, use a product-to-sum formula to find the exact value. (Refer to Example 2) **Exercise 12:** \[ \sin 82.5^\circ \cos 37.5^\circ \] --- **For Exercises 19–22**, write each expression as a product. (Refer to Example 3) **Exercise 20:** \[ \sin 30^\circ + \sin 10 \theta \]
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