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**Stationary waves....**

## Homework Statement

Which of the following equations can form stationary waves....

1. y=Asin(wt-kx)

2. y=Acos(wt-kx)

3. y=Asin(wt+kx)

4. y=Acos(wt+kx)

## Homework Equations

## The Attempt at a Solution

Answer is 1,3 and 2,4 which is obviously correct...But why cant other combinations be possible as long as they are travelling in opposite directions (like 2 and 3)?

And ya can standing waves be formed by waves of different amplitudes?