જો $m \cos (\alpha+\beta)-n \cos (\alpha-\beta)=m \cos (\alpha-\beta)+n \cos (\alpha+\beta)$ હોય,તો $\tan \alpha \tan \beta=$

  • A
    $m+n$
  • B
    $m-n$
  • C
    $-\frac{n}{m}$
  • D
    $\frac{m}{n}$

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