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The following equations represent transv...

The following equations represent transverse waves :
`z_(1) = A cos(kx - omegat)`,
`z_(2) = A cos (kx + omegat)`, `z_(3) = A cos (ky - omegat)`
Identify the combination (s) of the waves which will produce (i) standing wave(s), (ii) a wave travelling in the direction making an angle of `45^(@)` with the positive `x` and positive `y` axes. In each case, find the positions at which the resultant is always zero.

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A, B, C, D
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