A wave represented by the equation $y = A cos (kx - \omega t)$ is superimposed with another wave to form a statioary wave such that the point $x =0$ is a node. The equation of the other wave is:
  • A$-A sin (kx + \omega t)$
  • B$- A cos (kx + \omega t)$
  • C$A sin (kx + \omega t)$
  • D$A cos (kx + \omega t)$
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