Question
Asked Oct 19, 2019
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Why does eix=cos cos xi sin sin x ?

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Expert Answer

Step 1

To prove , or justify the identity exp(ix)= cosx+isinx

Step 2

Basically, this is an identity between ...

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Start with х e1 1!2! Replacex by ix, to get ix (ix)( e 1 (ix)(ix)(ix) (ix) + 4! 5! 1! 2! 3! 6! 7 х 1- 2! 3!5!7! 4! 6 cosxisinx

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