$\mathrm{y}=\mathrm{acos}(\mathrm{kx}+\mathrm{\omega t})$ superimposes on another wave giving a stationary wave having node at x = 0. What is the equation of the other wave

• A

  $-\mathrm{acos}(\mathrm{kx}+\mathrm{\omega t})$

• B

  $\mathrm{acos}(\mathrm{kx}-\mathrm{\omega t})$

• C

  $-\mathrm{acos}(\mathrm{kx}-\mathrm{\omega t})$

• D

  $-\mathrm{asin}(\mathrm{kx}+\mathrm{\omega t})$