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# Analytic functions

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Using the Pythagorean theorem (see attached) and knowing the sinz and cosz are analytic functions. What can we say about (see attached)

Show that cos(A+B)=cosAcosB-sinAsinB using exponential expressions for sin and cos

What are the zeros of

##### Solution Summary

This shows how to use the Pythagorean theorem to work with trigonometric analytic functions.

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We note , . Then we have

So we ...

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