Show that cos 3θ = cos3 θ − 3 cos θ sin2 θ and use this identity to find an equation in rectangular coordinates for the curve r = cos 3θ.

Trigonometry (MindTap Course List)
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ISBN:9781305652224
Author:Charles P. McKeague, Mark D. Turner
Publisher:Charles P. McKeague, Mark D. Turner
Chapter8: Complex Numbers And Polarcoordinates
Section: Chapter Questions
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Show that cos 3θ = cos3 θ − 3 cos θ sin2 θ and use this identity to find an equation in rectangular
coordinates for the curve r = cos 3θ.

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