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Show that Cos210 cos 70 - 3cos7@sin?78 and use this identity to find an equation in rectangular coordinates for the curve = 2cos218 I am not sure how to do this problem? Does anyone know? Also the answer has to equal (x +y)

Show that Cos210 cos 70 - 3cos7@sin?78 and use this identity to find an equation in rectangular coordinates for the curve = 2cos218 I am not sure how to do this problem? Does anyone know? Also the answer has to equal (x +y)

Trigonometry (MindTap Course List)
Trigonometry (MindTap Course List)
8th Edition
ISBN:9781305652224
Author:Charles P. McKeague, Mark D. Turner
Publisher:Charles P. McKeague, Mark D. Turner
Chapter8: Complex Numbers And Polarcoordinates
Section: Chapter Questions
Problem 5GP
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Here is the problem: Show that CoS210 = cos 70 - 3cos7@sin?7e %3D and use this identity to find an equation in rectangular coordinates for the curve = 2cos210 I am not sure how to do this problem? Does anyone know? Also the answer has to equal (x +y^)*
Transcribed Image Text:Here is the problem: Show that CoS210 = cos 70 - 3cos7@sin?7e %3D and use this identity to find an equation in rectangular coordinates for the curve = 2cos210 I am not sure how to do this problem? Does anyone know? Also the answer has to equal (x +y^)*
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