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Three travelling waves in same direction...

Three travelling waves in same direction arc superimposed. The equations of waves are `y_(1) = A_(0) sin(kx - omegat), y_(2) = 3sqrt2A_(0)sin(kx - omegat+ phi) and y_(3) = 4A_(0) cos(kx - omegat)` . If `0gephipi//2` and the phase difference between resultant wave and first wave is `pi// 4`, then `phi` is

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