The displacement of a particle in string stretched in $X$ direction is represented by $y.$ Among the following expressions for $y,$ those describing wave motions are
  • A$\cos kx\sin \omega \,t$
  • B${k^2}{x^2} - {\omega ^2}{t^2}$
  • C$\cos (kx + \omega \,t)$
  • DBoth $(a)$ and $(c)$
IIT 1987, Medium
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