prove that theta(2m) = theta(m) when m is odd and theta(2m) = 2 theta(m) when m is even

Algebra & Trigonometry with Analytic Geometry
13th Edition
ISBN:9781133382119
Author:Swokowski
Publisher:Swokowski
Chapter7: Analytic Trigonometry
Section7.3: The Addition And Subtraction Formulas
Problem 80E
Question

prove that theta(2m) = theta(m) when m is odd and theta(2m) = 2 theta(m) when m is even

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