Fourier Series Representation of Signals (Proof)

AI Thread Summary
The discussion focuses on understanding a specific step in the proof of Fourier Series representation of signals. The user is confused about how the first highlighted step transitions to the second, specifically regarding the application of the cosine addition formula. They express gratitude for any assistance provided and later downplay their question, indicating a realization that it may have been a simple oversight. The conversation highlights the collaborative nature of learning complex mathematical concepts.
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. (:

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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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