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Ch.12 - Parametric and Polar Curves
Briggs - Calculus: Early Transcendentals 3rd Edition
Briggs3rd EditionCalculus: Early TranscendentalsISBN: 9780136847243당신이 사용하는 게 아니라요?교과서 변경
12장, 문제 12.2.33

31–36. Converting coordinates Express the following Cartesian coordinates in polar coordinates in at least two different ways.


(1, √3)

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1
Recall the formulas to convert Cartesian coordinates \((x, y)\) to polar coordinates \((r, \theta)\): \(r = \sqrt{x^2 + y^2}\) \(\theta = \arctan\left(\frac{y}{x}\right)\)
Calculate the radius \(r\) by substituting \(x = 1\) and \(y = \sqrt{3}\) into the formula: \(r = \sqrt{1^2 + (\sqrt{3})^2}\)
Calculate the angle \(\theta\) using the arctangent formula: \(\theta = \arctan\left(\frac{\sqrt{3}}{1}\right)\)
Express the polar coordinates as \((r, \theta)\) using the values found in steps 2 and 3.
For the second way, express the angle \(\theta\) in degrees instead of radians or use a known angle value (e.g., \(\theta = \frac{\pi}{3}\) radians or \(60^\circ\)) to write the polar coordinates as \((r, \theta)\).

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주요 개념

질문에 올바르게 답하기 위해 반드시 이해해야 하는 핵심 개념들은 다음과 같습니다.

Cartesian and Polar Coordinate Systems

Cartesian coordinates represent points using (x, y) values on perpendicular axes, while polar coordinates describe points by their distance from the origin (r) and the angle (θ) from the positive x-axis. Understanding both systems is essential for converting between them.
추천 영상:
05:32
Intro to Polar Coordinates

Conversion Formulas Between Cartesian and Polar Coordinates

To convert from Cartesian (x, y) to polar (r, θ), use r = √(x² + y²) to find the radius and θ = arctan(y/x) to find the angle. Adjust θ based on the quadrant to get the correct direction.
추천 영상:
05:32
Intro to Polar Coordinates

Multiple Representations of Polar Coordinates

Polar coordinates are not unique; the same point can be represented by adding multiples of 2π to θ or by using negative r values with adjusted angles. Recognizing these alternatives allows expressing coordinates in at least two different valid ways.
추천 영상:
05:32
Intro to Polar Coordinates