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
You also want an ePaper? Increase the reach of your titles
YUMPU automatically turns print PDFs into web optimized ePapers that Google loves.
111.<br />
112.<br />
114.<br />
−2 2<br />
−3<br />
cos 3 cos2 <br />
3<br />
cos 2 cos sin 2 sin <br />
cos 3 3 sin 2 cos <br />
Let y1 cos3x and<br />
y 2 cos x 3 3sin x 2 cos x.<br />
cos 2 sin 2 cos 2 sin cos sin <br />
cos 3 sin 2 cos 2 sin 2 cos <br />
sin 4 2 sin 2 cos 2<br />
22 sin cos 1 2 sin 2 <br />
4 sin cos 1 2 sin 2 <br />
−2 2<br />
−3<br />
3<br />
−3<br />
cos 3x cos x<br />
sin 3x sin x <br />
3x x<br />
2 sin<br />
3x x<br />
2 cos<br />
− <br />
3<br />
<br />
2 sin 2x sin x<br />
2 cos 2x sin x<br />
tan 2x<br />
2 <br />
2 <br />
3x x<br />
sin<br />
2 <br />
3x x<br />
sin 2 <br />
116.<br />
Shifted upward by unit.<br />
Amplitude:<br />
Period: 2<br />
fx cos<br />
1<br />
2<br />
y<br />
2<br />
1<br />
a <br />
2<br />
1<br />
<br />
2 −1<br />
2 1 cos 2x<br />
x <br />
2<br />
1 cos 2x<br />
<br />
2 2<br />
−2<br />
π 2π<br />
Section 5.5 Multiple-Angle and Product-to-Sum Formulas 507<br />
x<br />
113.<br />
−2 2<br />
−3<br />
cos 4x cos 2x<br />
2 sin 3x<br />
115. sin2 x <br />
2<br />
1<br />
−1<br />
−2<br />
y<br />
3<br />
<br />
<br />
1 cos 2x<br />
2<br />
π 2π<br />
2 sin 3x sin x<br />
2 sin 3x<br />
cos 4x cos 2x<br />
Let y1 <br />
2 sin 3x<br />
and y2 sin x.<br />
4x 2x 4x 2x<br />
2 sin<br />
2 sin<br />
2 <br />
1 cos 2x<br />
<br />
2 2<br />
x<br />
2 sin 3x<br />
sin x<br />
117. sin2 arcsin x 2 sinarcsin x cosarcsin x<br />
2x1 x 2