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 (11th Edition)
11th Edition
ISBN:9780134217437
Author:Margaret L. Lial, John Hornsby, David I. Schneider, Callie Daniels
Publisher:Margaret L. Lial, John Hornsby, David I. Schneider, Callie Daniels
Chapter1: Trigonometric Functions
Section: Chapter Questions
Problem 1RE: 1. Give the measures of the complement and the supplement of an angle measuring 35°.
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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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