यदि $\tan \theta + \sin \theta = m$ और $\tan \theta - \sin \theta = n$ है,तो

  • A
    ${m^2} - {n^2} = 4\,mn$
  • B
    ${m^2} + {n^2} = 4\,mn$
  • C
    ${m^2} - {n^2} = {m^2} + {n^2}$
  • D
    ${m^2} - {n^2} = 4\sqrt {mn}$

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