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## Homework Statement

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A exp(iax)+B exp(ibx) = C exp(icx) for all x that A+B = C and a=b=c where they are all real constants.

## The Attempt at a Solution

first part easy

x = 0

A + B = C done

second part

d/dx -> (x=0) a A + b B = c (A + B) how do i make the last step?