3. (a) Change 0 = tan to an equivalent rectangular equation. (b) By changing to rectangular coordinates show that r= 4 sec2 (0/2) is a parabola. Find the focus and equation of the directrix of the parabola.

Trigonometry (11th Edition)
11th Edition
ISBN:9780134217437
Author:Margaret L. Lial, John Hornsby, David I. Schneider, Callie Daniels
Publisher:Margaret L. Lial, John Hornsby, David I. Schneider, Callie Daniels
Chapter1: Trigonometric Functions
Section: Chapter Questions
Problem 1RE: 1. Give the measures of the complement and the supplement of an angle measuring 35°.
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Number 3
### Educational Exercise Problems

1. **Find the equation of the ellipse:**
   - Eccentricity: \(\frac{3}{5}\)
   - Endpoints of the minor axis: \((-3, -5)\) and \((-3, 3)\)

2. **Solve the following:**
   - (a) Solve: \(x + \ln x \leq \ln x + 1\)
   - (b) Solve algebraically for \(x\) (exact answers only):
     \[
     \frac{e^x - e^{-x}}{2} = 2
     \]

3. **Convert and analyze equations:**
   - (a) Change \(\theta = \tan^{-1} \frac{3}{2}\) to an equivalent rectangular equation.
   - (b) By changing to rectangular coordinates, show that \(r = 4 \sec^2 (\theta/2)\) is a parabola. Find the focus and equation of the directrix of the parabola.

4. **Dissolution of a solid:**
   - If a solid is placed in water, the amount undissolved after \(t\) seconds is \(A(t) = A_0 e^{-kt}\). If 30 grams of the solid are placed in the water and it takes 10 seconds for half to dissolve, how long will it take for 3 grams to be left undissolved?

5. **Find the equation of the parabola:**
   - A parabola has a horizontal axis of symmetry, passing through the points \((0, 3)\), \((-2, 1)\), and \((6, -3)\).

6. **Repeat for emphasis**:
   - If a solid is placed in water, the amount undissolved after \(t\) seconds is \(A(t) = A_0 e^{-kt}\). If 30 grams of the solid are placed in the water and it takes 10 seconds for half to dissolve, how long will it take for 3 grams to be left undissolved?

---

**Note**: Problems may contain complex concepts requiring a strong understanding of calculus and algebra. Each task involves analyzing specific conditions, converting between different forms of equations, or solving for unknown variables.
Transcribed Image Text:### Educational Exercise Problems 1. **Find the equation of the ellipse:** - Eccentricity: \(\frac{3}{5}\) - Endpoints of the minor axis: \((-3, -5)\) and \((-3, 3)\) 2. **Solve the following:** - (a) Solve: \(x + \ln x \leq \ln x + 1\) - (b) Solve algebraically for \(x\) (exact answers only): \[ \frac{e^x - e^{-x}}{2} = 2 \] 3. **Convert and analyze equations:** - (a) Change \(\theta = \tan^{-1} \frac{3}{2}\) to an equivalent rectangular equation. - (b) By changing to rectangular coordinates, show that \(r = 4 \sec^2 (\theta/2)\) is a parabola. Find the focus and equation of the directrix of the parabola. 4. **Dissolution of a solid:** - If a solid is placed in water, the amount undissolved after \(t\) seconds is \(A(t) = A_0 e^{-kt}\). If 30 grams of the solid are placed in the water and it takes 10 seconds for half to dissolve, how long will it take for 3 grams to be left undissolved? 5. **Find the equation of the parabola:** - A parabola has a horizontal axis of symmetry, passing through the points \((0, 3)\), \((-2, 1)\), and \((6, -3)\). 6. **Repeat for emphasis**: - If a solid is placed in water, the amount undissolved after \(t\) seconds is \(A(t) = A_0 e^{-kt}\). If 30 grams of the solid are placed in the water and it takes 10 seconds for half to dissolve, how long will it take for 3 grams to be left undissolved? --- **Note**: Problems may contain complex concepts requiring a strong understanding of calculus and algebra. Each task involves analyzing specific conditions, converting between different forms of equations, or solving for unknown variables.
Expert Solution
Step 1

(a) Given equation is

θ=tan-132tanθ=32

We know that the relation between rectangular and polar coordinates is

x=rcosθ, y=rsinθr=x2+y2,tanθ=yx

Therefore, θ=tan-132 is equivalent to 

yx=323x-2y=0

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