यदि $\frac{\cos x}{\cos (x-2 y)}=\lambda$ है,तो $\tan (x-y) \tan y$ का मान क्या होगा?

  • A
    $\frac{1+\lambda}{1-\lambda}$
  • B
    $\frac{1-\lambda}{1+\lambda}$
  • C
    $\frac{\lambda}{1+\lambda}$
  • D
    $\frac{\lambda}{1-\lambda}$

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