What is the relationship among a, b, c, and d such that the equations x = a

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What is the relationship among a, b, c, and d such that the equations x = a cos t + b sin t, y = c cos t + d sin t describe a circle? What is the radius of the circle?

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Related Book For  answer-question

Calculus Early Transcendentals

ISBN: 978-0321947345

2nd edition

Authors: William L. Briggs, Lyle Cochran, Bernard Gillett

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