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C H A P T E R 5 Analytic Trigonometry

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21.<br />

22.<br />

13<br />

12<br />

3<br />

sin 4<br />

3<br />

cos 4<br />

3<br />

tan 4<br />

5<br />

12<br />

3 <br />

<br />

4 3<br />

<br />

<br />

4 6<br />

sin <br />

<br />

4 6<br />

cos <br />

<br />

4 6<br />

<br />

3<br />

<br />

3<br />

<br />

3<br />

tan <br />

<br />

4 6 <br />

3 <br />

sin <br />

4 3<br />

3 3 <br />

sin cos cos sin<br />

4 3 4 3<br />

2<br />

2 1<br />

2<br />

2<br />

4<br />

3 <br />

cos <br />

4 3<br />

cos 3<br />

4<br />

2<br />

2 1 2<br />

2 2 3<br />

2 23<br />

1<br />

4<br />

3 <br />

tan <br />

4 3<br />

<br />

<br />

sin <br />

4<br />

cos <br />

4<br />

2<br />

2 3<br />

2 <br />

2<br />

1 3 3 1<br />

4<br />

cos <br />

3<br />

tan 3 <br />

tan<br />

4 3<br />

1 tan 3 <br />

tan<br />

4 3<br />

2<br />

2 3<br />

2 <br />

3 <br />

sin sin<br />

4 3<br />

1 3<br />

<br />

1 3 <br />

1 3 1 3 4 23<br />

2 3<br />

1 3 1 3 2<br />

cos <br />

6<br />

2<br />

2 3<br />

2 <br />

cos <br />

6<br />

tan <br />

tan<br />

4 6<br />

1 tan <br />

4<br />

<br />

cos sin<br />

4 6<br />

<br />

sin sin<br />

4 6<br />

tan <br />

6<br />

2<br />

2 1<br />

2<br />

2<br />

2 1<br />

2<br />

<br />

2<br />

3 1<br />

4<br />

2<br />

3 1<br />

4<br />

1 3<br />

3<br />

1 1 3<br />

3 2<br />

3 <br />

23. cos 25 cos 15 sin 25 sin 15 cos25 15 cos 40<br />

24. sin 140 cos 50 cos 140 sin 50 sin140 50 sin 190<br />

Section 5.4 Sum and Difference Formulas 477

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