Find the formula of cos 3z and cosh 3z using (cos z, sin z) and (cosh z, and sinh z).

Elements Of Modern Algebra
8th Edition
ISBN:9781285463230
Author:Gilbert, Linda, Jimmie
Publisher:Gilbert, Linda, Jimmie
Chapter7: Real And Complex Numbers
Section7.3: De Moivre’s Theorem And Roots Of Complex Numbers
Problem 2E: Find each of the following products. Write each result in both trigonometric and standard...
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Find the formula of cos 3z and cosh 3z using (cos z, sin z) and (cosh z, and sinh z).

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