1a) Convert the Cartesian equation (x^2 +y^2-1)^2 +4y^2-1 = 0 to polar coordinates. 1b) Use a trigonometric identity to show that the polar equation can be simplified as r^2 = 2 cos 2θ. Explain why all the solutions of the original equation are still solutions of this equation (noting that you have probably divided both sides by r^2).

Calculus: Early Transcendentals
8th Edition
ISBN:9781285741550
Author:James Stewart
Publisher:James Stewart
Chapter1: Functions And Models
Section: Chapter Questions
Problem 1RCC: (a) What is a function? What are its domain and range? (b) What is the graph of a function? (c) How...
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1a) Convert the Cartesian equation (x^2 +y^2-1)^2 +4y^2-1 = 0 to polar coordinates.
1b) Use a trigonometric identity to show that the polar equation can be simplified
as r^2 = 2 cos 2θ. Explain why all the solutions of the original equation are still
solutions of this equation (noting that you have probably divided both sides by
r^2).

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for 1b of this question, could you explain why why all the solutions of the original equation are still solutions of this equation

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