Fourier Series Representation of Signals (Proof)

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Homework Help Overview

The discussion revolves around the proof of Fourier series representation of signals, specifically focusing on a step involving trigonometric identities.

Discussion Character

  • Exploratory, Assumption checking

Approaches and Questions Raised

  • The original poster attempts to understand the transition between two steps in the proof, seeking clarification on the reasoning involved.

Discussion Status

Some participants provide a trigonometric identity as a potential explanation for the step in question. However, there is no explicit consensus on the clarity of the reasoning, and one participant expresses a realization that may indicate a shift in understanding.

Contextual Notes

There is an indication of uncertainty regarding the clarity of the proof steps, with one participant questioning the validity of their inquiry.

Icetray
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Hi guys,

I was studying the proof below and just can't figure out the the first highlighted step leads to the second and I was wondering if you guys can help me to fill that in. (:

fxylpkz.jpg


Thank you so much for your help in advance guys!
 
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It follows from:

cos(a+b)= cos(a)cos(b)-sin(a)sin(b)
 
MathematicalPhysicist said:
It follows from:

cos(a+b)= cos(a)cos(b)-sin(a)sin(b)

Thank you so much! :D
 
-- it's okay, I for it. Really stupid question. hahaha ---
 

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