From Euler’s formula e^it= cos(t) + isin(t) show that a) cos(t)= 1/2(e^it+e^-it) then show cos(it)=cosh(t)= 1/2(e^t+e^-t) and cosh(it)= cos(t)

Algebra & Trigonometry with Analytic Geometry
13th Edition
ISBN:9781133382119
Author:Swokowski
Publisher:Swokowski
Chapter6: The Trigonometric Functions
Section6.4: Values Of The Trigonometric Functions
Problem 23E
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From Euler’s formula e^it= cos(t) + isin(t) show that

a) cos(t)= 1/2(e^it+e^-it) then show cos(it)=cosh(t)= 1/2(e^t+e^-t) and cosh(it)= cos(t)

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