The stationary wave $y = 2a{\mkern 1mu} \,\,sin\,\,{\mkern 1mu} kx{\mkern 1mu} \,\,cos{\mkern 1mu} \,\omega t$ in a stretched string is the result of superposition of $y_1 = a\,sin\,(kx -\omega t)$ and

  • A

    ${y_2}\, = \,a\,\cos \,\left( {kx\, + \,\omega t} \right)$

  • B

    ${y_2}\, = \,a\,\sin \,\left( {kx\, + \,\omega t} \right)$

  • C

    ${y_2}\, = \,a\,\cos \,\left( {kx\, - \,\omega t} \right)$

  • D

    ${y_2}\, = \,a\,\sin \,\left( {kx\, - \,\omega t} \right)$

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