Which two of the given transverse waves will give stationary waves when get superimposed
${z_1} = a\cos (kx - \omega \,t)$.....$(A)$
${z_2} = a\cos (kx + \omega \,t)$.....$(B)$
${z_3} = a\cos (ky - \omega \,t)$..... $(C)$
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(a) Waves $A$ and $B$ satisfied the conditions required for a standing wave.
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