Answer
$r_1r_2,\theta_1+\theta_2,\theta_1+\theta_2$.
Work Step by Step
When multiplying the two given complex numbers, we have $z_1z_2=r_1r_2[cos(\theta_1+\theta_2)+i\ sin(\theta_1+\theta_2)]$.
Precalculus: Concepts Through Functions, A Unit Circle Approach to Trigonometry (3rd Edition)
by Sullivan III, Michael
Published by
Pearson
ISBN 10:
0-32193-104-1
ISBN 13:
978-0-32193-104-7
Chapter 8 - Polar Coordinates; Vectors - Section 8.3 The Complex Plane; De Moivre's Theorem - 8.3 Assess Your Understanding - Page 614: 7
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