- #1

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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. (:

Thank you so much for your help in advance guys!

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- Thread starter Icetray
- Start date

- #1

- 84

- 0

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. (:

Thank you so much for your help in advance guys!

- #2

MathematicalPhysicist

Gold Member

- 4,562

- 294

It follows from:

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

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

- #3

- 84

- 0

It follows from:

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

Thank you so much! :D

- #4

- 84

- 0

-- it's okay, I for it. Really stupid question. hahaha ---

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