{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

Section 5.2 handout ann_1

# Section 5.2 handout ann_1 - Section 5.2 Section 5.2 Sum and...

This preview shows pages 1–2. Sign up to view the full content.

Section 5.2 Sum and Difference Formulas, Page 1 Section 5.2: Sum and Difference Formulas 1) Objective 1: Use the Formula for the Cosine of the Difference of Two Angles . cos ( α β ) = cos α cos β + sin α sin β a. Example 1 :   See Example 1, page 557 2 nd  ed or page 582 3 rd  ed.  Find the exact value of cos   15 ° . Step 1 : Find two angles whose difference is equal to the given angle and whose exact trig values are known.  Our  only choices are  π (180 ° ),  π /2 (90 ° ),  π /4 (45 ° ),      π /3 (60 ° ),   π /6 (30 ° ), or multiples thereof. Step 2 : Use the cosine difference formula. Step 3 : Simplify. b. See Example 2 page 557 2 nd  ed or page 582 3 rd  ed. Find the exact value of cos 80 ° cos 20 °  + sin 80 ° sin 20 ° Step 1 . Notice that 80 °  and 20 °  occur in both terms and that you have cos cos + sin sin.  This is the result of what  formula?

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

### Page1 / 5

Section 5.2 handout ann_1 - Section 5.2 Section 5.2 Sum and...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document
Ask a homework question - tutors are online