# Sine wave & reflection question?

by shintashi
Tags: reflection, sine, wave
 P: 82 I seem to recall it is possible to change a wave's frequency, pattern, and amplitude by adding another wave to it. Is it possible to add a second wave to a Sine wave to turn it into a cosine wave of the same amplitude and how would you do this? I'm thinking if I had an amplitude 1 for the sinewave, an amplitude 2 cosine wave would wipe out the sine wave and be reduced to a cosine wave. Is there a simpler way of doing this requiring less amplitude? As a side note on waves, is there a good place/website to understand the physics behind reflection?
 PF Patron Sci Advisor Thanks Emeritus P: 38,387 This is a question, not "learning materials" so I am moving this to "Introductory Physics".
 P: 289 So you think sin(x)+2cos(x) = cos(x)? If this were true, then sin(x) = -cos(x) would also be true (which it isn't). What you're probably thinking of is the superposition of waves. I'm not sure what specifically you're looking for in regards to reflection (sound? light? mechanical waves?), but a couple of sites that have been handy for me are hyperphysics and PhET (I seem to recall a simulation or two involving waves/pulses on a string)

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