Equivalence of two sine arguments

  • Thread starter acherentia
  • Start date
  • #1
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Homework Statement



Hecht in his optics mentions that Asin(kx-wt+pi) is equivalent to Asin(wt-kx)
w=greek omega

Homework Equations


What is the fundamental reason behind this?

The Attempt at a Solution



I have a hunch it's plain trigonometry applied, but none of the things that I can think of bring up this result.
 

Answers and Replies

  • #2
ideasrule
Homework Helper
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Do you know the identity sin(a+b)=sin(a)cos(b)+sin(b)cos(a)?
 
  • #3
48
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yes, i do it works that way and thank you very much. I solved it too with a geometrical argument on the trig circle, but i like your approach much better.
 

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