# Analytic functions

Please see the attachment

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

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#### Solution Preview

Please see the attachment.

We note , . Then we have

So we ...

#### Solution Summary

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

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