Derive the trig identities cos(2x) = cos²(x) = sin²(x) and sin(2x) = 2 cos(x) sin (x) without using trig identities (Use Euler's Formula)

Algebra & Trigonometry with Analytic Geometry
13th Edition
ISBN:9781133382119
Author:Swokowski
Publisher:Swokowski
Chapter6: The Trigonometric Functions
Section6.2: Trigonometric Functions Of Angles
Problem 95E
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1. Derive the trig identities cos(2x) = cos² (x) — sin² (x) and sin(2x) = 2 cos(x) sin (x)
without using trig identities (Use Euler's Formula)
Transcribed Image Text:1. Derive the trig identities cos(2x) = cos² (x) — sin² (x) and sin(2x) = 2 cos(x) sin (x) without using trig identities (Use Euler's Formula)
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