/*! This file is auto-generated */ .wp-block-button__link{color:#fff;background-color:#32373c;border-radius:9999px;box-shadow:none;text-decoration:none;padding:calc(.667em + 2px) calc(1.333em + 2px);font-size:1.125em}.wp-block-file__button{background:#32373c;color:#fff;text-decoration:none} Problem 47 Give a complete graph of each po... [FREE SOLUTION] | 91Ó°ÊÓ

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Give a complete graph of each polar equation. Also identify the type of polar graph. $$r=3+\cos \theta$$

Short Answer

Expert verified
The graph is a ³¢¾±³¾²¹Ã§´Ç²Ô with an inner loop.

Step by step solution

01

- Identify the General Form

The given polar equation is written as: \[ r = 3 + \cos \theta \]Recognize that it is in the form of: \[ r = a + b \cos \theta \]where \(a = 3\) and \(b = 1\)
02

- Determine the Type of Polar Graph

The polar equation \(r = a + b \cos \theta\) describes a ³¢¾±³¾²¹Ã§´Ç²Ô. Based on the relationship between \(a\) and \(b\), identify the type of ³¢¾±³¾²¹Ã§´Ç²Ô: Since \(|b| < |a|\) (\(1 < 3\)), the ³¢¾±³¾²¹Ã§´Ç²Ô does not have an inner loop. This specific graph is called a ³¢¾±³¾²¹Ã§´Ç²Ô with an inner loop.
03

- Calculate Critical Points

Find the maximum and minimum values of \(r\) by plugging in values of \(\theta\): When \( \theta = 0\): \[ r = 3 + \cos 0 = 3 + 1 = 4 \]When \( \theta = \pi\): \[ r = 3 + \cos \pi = 3 - 1 = 2 \]
04

- Plot the Polar Points

Plot the points for several values of \(\theta\) (such as 0, \(\pi/2\), \(\pi\), and \(3\pi/2\)) to understand the overall shape. For example, for \(\theta = \pi/2\) and \(\theta = 3\pi/2\), \[ r = 3 + \cos (\pi/2) = 3 + 0 = 3 \]
05

- Sketch the Graph

With the calculated points, sketch the complete graph of the polar equation \(r = 3 + \cos \theta\). The resulting graph should resemble a ³¢¾±³¾²¹Ã§´Ç²Ô with an inner loop, extending farther on the right and creating a dimple on the left relative to the pole.

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

³¢¾±³¾²¹Ã§´Ç²Ô
The term '³¢¾±³¾²¹Ã§´Ç²Ô' comes from the French word for snail. ³¢¾±³¾²¹Ã§´Ç²Ôs are a special type of polar graph characterized by their distinctive shape. The general form of the equation for a ³¢¾±³¾²¹Ã§´Ç²Ô is . Here, 'a' and 'b' are constants that determine the shape of the ³¢¾±³¾²¹Ã§´Ç²Ô. Depending on the values of 'a' and 'b', it can have different appearances:
  • If , the ³¢¾±³¾²¹Ã§´Ç²Ô has an inner loop.
  • If , the ³¢¾±³¾²¹Ã§´Ç²Ô will touch the pole but not loop through it.
  • If , the ³¢¾±³¾²¹Ã§´Ç²Ô will be a significantly distorted shape without any loops.

For the given equation , since and , the resulting graph is a ³¢¾±³¾²¹Ã§´Ç²Ô without an inner loop. However, it will show a 'dimpling' effect where the curve indents but does not loop.
Polar Coordinates
To fully understand ³¢¾±³¾²¹Ã§´Ç²Ô graphs, it's important to understand polar coordinates. Unlike regular Cartesian coordinates which use to plot points, polar coordinates use . Here ‘r’ represents the distance from the pole (origin) and is the angle measured counter-clockwise from the positive x-axis. This way of plotting is especially helpful for capturing circular and spiral patterns. ³¢¾±³¾²¹Ã§´Ç²Ôs, being one such pattern, rely on this system to showcase their unique shapes.
Plotting Polar Equations
Plotting polar equations like involves several crucial steps:1. **Identify the form**: Notice the form of the equation. Here, it's a standard form of a ³¢¾±³¾²¹Ã§´Ç²Ô where and .
2. **Determine type**: Based on the and values, classify the type of ³¢¾±³¾²¹Ã§´Ç²Ô. The given equation results in a ³¢¾±³¾²¹Ã§´Ç²Ô without an inner loop.
3. **Calculate key points**: Find the maximum and minimum by substituting key values. For instance, at and at . This tells us the farthest and closest points from the pole.
4. **Plot points**: Choose various values like , , and to find corresponding values. This gives a general shape. For example, at and at .
5. **Draw graph**: Connect plotted points smoothly to sketch the ³¢¾±³¾²¹Ã§´Ç²Ô. The graph will reflect its distinctive shape, showing how it extends and dimples based on the calculations.

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