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C H A P T E R 5 Analytic Trigonometry

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478 Chapter 5 <strong>Analytic</strong> <strong>Trigonometry</strong><br />

25.<br />

tan 325 tan 86<br />

tan325 86 tan 239<br />

1 tan 325 tan 86<br />

27. sin 3 cos 1.2 cos 3 sin 1.2 sin3 1.2 sin 1.8<br />

29.<br />

tan 2x tan x<br />

tan2x x tan 3x<br />

1 tan 2x tan x<br />

31. sin 330 cos 30 cos 330 sin 30 sin330 30<br />

33.<br />

35.<br />

sin <br />

12<br />

cos <br />

4<br />

cos <br />

12<br />

sin <br />

3<br />

3<br />

2<br />

sin 300<br />

3<br />

2<br />

<br />

sin sin <br />

4 12 4<br />

tan 25 tan 110<br />

tan25 110 36.<br />

1 tan 25 tan 110<br />

tan 135<br />

1<br />

For Exercises 37–44, we have:<br />

5<br />

sin u , u in Quadrant II ⇒<br />

13<br />

in Quadrant II ⇒ tan v 4<br />

4<br />

cos v 3,<br />

v<br />

sin v <br />

5<br />

cos u 12<br />

13 ,<br />

y<br />

( −12,<br />

5)<br />

13 u<br />

5 ,<br />

tan u 5<br />

12<br />

x<br />

3 ,<br />

26.<br />

28.<br />

tan 140 tan 60<br />

tan140 60 tan 80<br />

1 tan 140 tan 60<br />

cos <br />

7<br />

cos <br />

5<br />

sin <br />

7<br />

sin <br />

5<br />

<br />

cos <br />

7 5<br />

cos 12<br />

35<br />

30. cos 3x cos 2y sin 3x sin 2y cos3x 2y<br />

32. cos 15 cos 60 sin 15 sin 60 cos15 60<br />

34.<br />

cos <br />

16<br />

cos 3<br />

16<br />

sin <br />

16<br />

tan 5 <br />

4 tan12 1 tan 5<br />

4 <br />

( −3,<br />

4)<br />

Figures for Exercises 37– 44<br />

5<br />

y<br />

v<br />

tan <br />

12<br />

cos45 2<br />

2<br />

3 3<br />

sin cos <br />

16 16 16<br />

tan 7<br />

6 <br />

cos 2<br />

<br />

4 2<br />

5 <br />

tan <br />

4 12<br />

tan 3<br />

6 3<br />

x

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