Q. 77 The letters r and 胃聽represent ... [FREE SOLUTION]

91影视

Precalculus Enhanced with Graphing Utilities

Sullivan

$Math Studyset 91影视 Explanations$ Math

6th Edition 路 1200 pages

ISBN: 9780321795465

Chapter 9: Q. 77 (page 568)

The letters r and $胃$ represent polar coordinates. Write each equation using rectangular coordinates $(x, y)$ .
$r^{2} = \cos 胃$

Short Answer

Expert verified

The equation is written using rectangular coordinates as ${(x^{2} + y^{2})}^{\frac{3}{2}} - x = 0$ .

Step by step solution

Step 1. Given Information

We are given an equation $r^{2} = \cos 胃$ .

We need to write the equation using rectangular coordinates.

Step 2. Concept Used

If P is a point with polar coordinates $(r, 胃)$ , the rectangular coordinates $(x, y)$ of P are given by

role="math" $x = r \cos 胃 y = r \sin 胃$

And it implies that

$x^{2} + y^{2} = r^{2}$

Step 3. Modify the relations

As $x^{2} + y^{2} = r^{2}$ , so we can take square root both side and see that

$\sqrt{x^{2} + y^{2}} = \sqrt{r^{2}} \sqrt{x^{2} + y^{2}} = r$

Now substitute $\sqrt{x^{2} + y^{2}}$ for in the rectangular coordinates formula

role="math" $\begin{array}{rcl} x & = & r \cos 胃 \\ x & = & \sqrt{x^{2} + y^{2}} \cos 胃 \\ \frac{x}{\sqrt{x^{2} + y^{2}}} & = & \cos 胃 \end{array}$

and

$\begin{array}{rcl} y & = & r \sin 胃 \\ y & = & \sqrt{x^{2} + y^{2}} \sin 胃 \\ \frac{y}{\sqrt{x^{2} + y^{2}}} & = & \sin 胃 \end{array}$

Step 4. Convert into rectangular coordinates

In the given equation $r^{2} = \cos 胃$ , substitute $x^{2} + y^{2}$ for $r^{2}$ and $\frac{x}{\sqrt{x^{2} + y^{2}}}$ for $\cos 胃$ we get

$\begin{array}{rcl} r^{2} & = & \cos 胃 \\ x^{2} + y^{2} & = & \frac{x}{\sqrt{x^{2} + y^{2}}} \\ (x^{2} + y^{2}) (\sqrt{x^{2} + y^{2}}) & = & x \\ {(x^{2} + y^{2})}^{\frac{3}{2}} - x & = & 0 \end{array}$

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91影视

The letters r and $胃$ represent polar coordinates. Write each equation using rectangular coordinates $(x, y)$ .
$r^{2} = \cos 胃$

Short Answer

Step by step solution

Step 1. Given Information

Step 2. Concept Used

Step 3. Modify the relations

Step 4. Convert into rectangular coordinates

One App. One Place for Learning.

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91影视

The letters r and 胃represent polar coordinates. Write each equation using rectangular coordinates x,y.r2=cos胃

Short Answer

Step by step solution

Step 1. Given Information

Step 2. Concept Used

Step 3. Modify the relations

Step 4. Convert into rectangular coordinates

One App. One Place for Learning.

Most popular questions from this chapter

Recommended explanations on Math Textbooks

Geometry

Logic and Functions

Pure Maths

Theoretical and Mathematical Physics

Applied Mathematics

Decision Maths

Study anywhere. Anytime. Across all devices.

The letters r and $胃$ represent polar coordinates. Write each equation using rectangular coordinates $(x, y)$ .
$r^{2} = \cos 胃$