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## Homework Statement

## The Attempt at a Solution

I don't understand the step above. It has something to do with this equation

I think. I'm supposed to expand it into an appropriate fourier series.

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- Thread starter robertjford80
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- #1

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I don't understand the step above. It has something to do with this equation

I think. I'm supposed to expand it into an appropriate fourier series.

- #2

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- #3

HallsofIvy

Science Advisor

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Are you saying you do not know what that is?

- #4

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here is some more info

I don't understand why they're adding the sin on to that last step.

I don't understand why they're adding the sin on to that last step.

- #5

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I don't understand why they're adding the sin on to that last step.

What is the

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