Given below are the some of the function of x and t to represent the displacement
(transverse or longitudnal ) of an elastic wave . State whether it is stationary or travelling
wave or none of them.
(i) y = 3sin(5x+0.5t) + 4cos(5x+0.5t)
(ii) y = 3sin(5x+0.5t) + 4cos(5x-0.5t)
(iii) y = cosxsint + cos2x/sin2t
(iii) y = 3sin(5x-0.5t) + cos2xsin2t