The problem asks us to sketch the graph of the polar equation $r = 2\sin(2\theta)$.

GeometryPolar CoordinatesGraphingPolar EquationsFour-Leaf Rose
2025/6/3

1. Problem Description

The problem asks us to sketch the graph of the polar equation r=2sin(2θ)r = 2\sin(2\theta).

2. Solution Steps

We need to analyze the polar equation r=2sin(2θ)r = 2\sin(2\theta) to determine the shape of the graph.
First, let's consider some key values of θ\theta and find the corresponding values of rr:
- θ=0\theta = 0: r=2sin(0)=0r = 2\sin(0) = 0
- θ=π4\theta = \frac{\pi}{4}: r=2sin(π2)=2r = 2\sin(\frac{\pi}{2}) = 2
- θ=π2\theta = \frac{\pi}{2}: r=2sin(π)=0r = 2\sin(\pi) = 0
- θ=3π4\theta = \frac{3\pi}{4}: r=2sin(3π2)=2r = 2\sin(\frac{3\pi}{2}) = -2
- θ=π\theta = \pi: r=2sin(2π)=0r = 2\sin(2\pi) = 0
- θ=5π4\theta = \frac{5\pi}{4}: r=2sin(5π2)=2r = 2\sin(\frac{5\pi}{2}) = 2
- θ=3π2\theta = \frac{3\pi}{2}: r=2sin(3π)=0r = 2\sin(3\pi) = 0
- θ=7π4\theta = \frac{7\pi}{4}: r=2sin(7π2)=2r = 2\sin(\frac{7\pi}{2}) = -2
- θ=2π\theta = 2\pi: r=2sin(4π)=0r = 2\sin(4\pi) = 0
The graph of r=2sin(2θ)r = 2\sin(2\theta) is a four-leaf rose. Each leaf is symmetric about its axis.
- The first leaf is in the first quadrant, extending from θ=0\theta = 0 to θ=π2\theta = \frac{\pi}{2}, with a maximum at θ=π4\theta = \frac{\pi}{4}.
- The second leaf is in the second quadrant, extending from θ=π2\theta = \frac{\pi}{2} to θ=π\theta = \pi.
- The third leaf is in the third quadrant, extending from θ=π\theta = \pi to θ=3π2\theta = \frac{3\pi}{2}.
- The fourth leaf is in the fourth quadrant, extending from θ=3π2\theta = \frac{3\pi}{2} to θ=2π\theta = 2\pi.
Each leaf has a maximum distance of 2 from the origin.

3. Final Answer

The graph of r=2sin(2θ)r = 2\sin(2\theta) is a four-leaf rose, where each leaf has a maximum radius of 2.

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