Two waves represented by ;  and  .are superposed. The resultant wave has an amplitude equal to :-zero2aa

It seems like there's a mistake in your question as it's not clear. However, I'll try to provide a general answer about the superposition of two waves.

When two waves are superposed, the resultant wave's amplitude depends on the phase difference and the individual amplitudes of the two waves.

1. If the two waves are in phase (i.e., they reach their maximum and minimum values at the same time), the resultant wave will have an amplitude equal to the sum of the amplitudes of the two waves.

2. If the two waves are out of phase (i.e., when one wave is at its maximum, the other is at its minimum), the resultant wave will have an amplitude equal to the difference of the amplitudes of the two waves.

3. If the two waves are in opposite phase (i.e., they are 180 degrees out of phase), and they have the same amplitude, the resultant wave will have an amplitude of zero. This is because the positive displacement of one wave will cancel out the negative displacement of the other wave.

Without specific values or more information, it's not possible to provide a more specific answer.