Two transverse waves A and B superimpose...

Two transverse waves A and B superimposed to produce a node at x = 0. If the equation of wave A si `y= a cos (kx-omegat)`, then the equation of wave B is

`y = a sin(omega t + kx)`

`y = -a sin(omega t +kx)`

`y = a sin (omega t - kx)`

`y = -a sin (omega t - kx)`

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