Single Variable Calculus: Early Transcendentals
Single Variable Calculus: Early Transcendentals
8th Edition
ISBN: 9781305270336
Author: James Stewart
Publisher: Cengage Learning
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Chapter H, Problem 48E

Use Euler’s formula to prove the following formulas for cos x and sin x:

cos x = e i x + e i x 2 sin x = e i x e i x 2 i

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