In Exercises 21–40, eliminate the parameter t. Then use the rectangular equation to sketch the plane curve represented by the given parametric equations. Use arrows to show the orientation of the curve corresponding to increasing values of t. (If an interval for t is not specified, assume that −∞ < t < ∞. x = t, y = 2t
Table of contents
- 0. Review of College Algebra4h 45m
- 1. Measuring Angles40m
- 2. Trigonometric Functions on Right Triangles2h 5m
- 3. Unit Circle1h 19m
- 4. Graphing Trigonometric Functions1h 19m
- 5. Inverse Trigonometric Functions and Basic Trigonometric Equations1h 41m
- 6. Trigonometric Identities and More Equations2h 34m
- 7. Non-Right Triangles1h 38m
- 8. Vectors2h 25m
- 9. Polar Equations2h 5m
- 10. Parametric Equations1h 6m
- 11. Graphing Complex Numbers1h 7m
9. Polar Equations
Polar Coordinate System
Multiple Choice
Plot the point on the polar coordinate system.
(−2,32π)
A
B
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D
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Verified step by step guidance1
Understand that polar coordinates are given in the form (r, θ), where r is the radius (distance from the origin) and θ is the angle from the positive x-axis.
The given polar coordinate is (-2, \(\frac{2\pi}{3}\)). The negative radius indicates that the point is in the opposite direction of the angle.
First, locate the angle \(\frac{2\pi}{3}\) on the polar coordinate system. This angle is in the second quadrant, 120 degrees from the positive x-axis.
Since the radius is negative, move 2 units in the opposite direction of the angle \(\frac{2\pi}{3}\). This means you will move 2 units in the direction of the angle \(\frac{5\pi}{3}\) (or 300 degrees), which is directly opposite to \(\frac{2\pi}{3}\).
Plot the point at this location, which should be in the fourth quadrant, 2 units from the origin along the line of \(\frac{5\pi}{3}\).
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