C H A P T E R 5 Analytic Trigonometry
C H A P T E R 5 Analytic Trigonometry
C H A P T E R 5 Analytic Trigonometry
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494 Chapter 5 <strong>Analytic</strong> <strong>Trigonometry</strong><br />
18.<br />
sin 2x cos 2x 2 1<br />
sin 2 2x 2 sin 2x cos 2x cos 2 2x 1<br />
2 sin 2x cos 2x 0<br />
19. 6 sin x cos x 32 sin x cos x<br />
3 sin 2x<br />
21. 4 8 sin2 x 41 2 sin2 x<br />
23.<br />
25.<br />
4 cos 2x<br />
sin 4x 0<br />
4x n<br />
x n<br />
4<br />
sin u 4 3<br />
, < u < ⇒ cos u 3<br />
5 2 5<br />
sin 2u 2 sin u cos u 24 53 24<br />
5 25<br />
x 0, 3 5 3 7<br />
, , , , , ,<br />
4 2 4 4 2 4<br />
2 tan u<br />
tan 2u <br />
1 tan2 243<br />
<br />
u 1 16 <br />
9<br />
8<br />
39 7 24<br />
cos 2u cos<br />
7<br />
2 u sin2 u 9 16<br />
<br />
25 25 7<br />
25<br />
tan u 3 <br />
, 0 < u <<br />
4 2<br />
sin 2u 2 sin u cos u 2 3<br />
5 4 24<br />
5 25<br />
cos 2u cos2 u sin2 u 16 9 7<br />
<br />
25 25 25<br />
tan 2u <br />
2 tan u<br />
1 tan 2 u<br />
3<br />
4<br />
⇒ sin u and cos u <br />
5 5<br />
234<br />
<br />
1 9 <br />
16<br />
3<br />
2 16 24<br />
7 <br />
7<br />
20.<br />
6 cos 2 x 3 32 cos 2 x 1<br />
3 cos 2x<br />
22. cos x sin xcos x sin x cos2 x sin2 x<br />
24.<br />
cos u 2 <br />
, < u < <br />
3 2<br />
tan 2u <br />
3<br />
5 u<br />
−2<br />
2 tan u<br />
1 tan 2 u <br />
csc u 3, <br />
2 < u < <br />
y<br />
x<br />
cos 2x<br />
sin 2u 2 sin u cos u 2 5 2 45<br />
3 3 9<br />
cos 2u cos2 u sin2 u 4 5 1<br />
<br />
9 9 9<br />
25 2 <br />
1 5<br />
45<br />
4