1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Homework Help: How do I add these?

  1. Nov 27, 2007 #1
    I am stumped on how to add these together...

    y=A sin(kx+wt)


    y=A sin(kx-wt)

    any help is greatly appreciated!
  2. jcsd
  3. Nov 27, 2007 #2
    It depends on what you are trying to do with them. Are you adding them in order to simplify them to a smaller equation or are you adding them in order to graph them?
  4. Nov 27, 2007 #3
    I am actually trying to show that these are waves, and that the sum of these 2 traveling waves is the standing wave described by the equation

    y=2a {sin(kx) sin(wt)}

    The former equations are waves traveling to the right and left, respectively.

  5. Nov 27, 2007 #4
    Remember that sin(x+y)=cos(x)sin(y)+sin(x)cos(y).

    Use that on both of the different equations and add the similar figures. You should get your answer.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook