Trigonometry (11th Edition) Clone

Published by Pearson
ISBN 10: 978-0-13-421743-7
ISBN 13: 978-0-13421-743-7

Chapter 8 - Complex Numbers, Polar Equations, and Parametric Equations - Section 8.6 Parametric Equations, Graphs, and Applications - 8.6 Exercises - Page 404: 39

Answer

$x = 2~cos~t$ $y = 3~sin~2t$ $0 \leq t \leq 6.5$ We can see the graph in the window $[-6,6]$ by $[-4,4]$

Work Step by Step

$x = 2~cos~t$ $y = 3~sin~2t$ $0 \leq t \leq 6.5$ When $t = 0$: $x = 2~cos~0 = 2$ $y = 3~sin~[2(0)] = 0$ When $t = \frac{\pi}{4}$: $x = 2~cos~\frac{\pi}{4} = 1.41$ $y = 3~sin~[2(\frac{\pi}{4})] = 3$ When $t = \frac{\pi}{3}$: $x = 2~cos~\frac{\pi}{3} = 1$ $y = 3~sin~[2(\frac{\pi}{3})] = 2.6$ When $t = \frac{\pi}{2}$: $x = 2~cos~\frac{\pi}{2} = 0$ $y = 3~sin~[2(\frac{\pi}{2})] = 0$ When $t = \frac{2\pi}{3}$: $x = 2~cos~\frac{2\pi}{3} = -1$ $y = 3~sin~[2(\frac{2\pi}{3})] = -2.6$ When $t = \frac{3\pi}{4}$: $x = 2~cos~\frac{3\pi}{4} = -1.41$ $y = 3~sin~[2(\frac{3\pi}{4})] = -3$ When $t = \pi$: $x = 2~cos~\pi = 2$ $y = 3~sin~(2\pi) = 0$ When $t = \frac{5\pi}{4}$: $x = 2~cos~\frac{5\pi}{4} = -1.41$ $y = 3~sin~[2(\frac{5\pi}{4})] = 3$ When $t = \frac{3\pi}{2}$: $x = 2~cos~\frac{3\pi}{2} = 0$ $y = 3~sin~[2(\frac{3\pi}{2})] = 0$ When $t = \frac{7\pi}{4}$: $x = 2~cos~\frac{7\pi}{4} = 1.41$ $y = 3~sin~[2(\frac{7\pi}{4})] = -3$ When $t = 2\pi$: $x = 2~cos~2\pi = 2$ $y = 3~sin~(4\pi) = 0$ When $t = 6.5$: $x = 2~cos~6.5 = 1.95$ $y = 3~sin~13 = 1.26$ We can see the graph in the window $[-6,6]$ by $[-4,4]$
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