જો $\frac{\cos (A+B)}{\cos (A-B)}=\frac{\sin (C+D)}{\sin (C-D)}$ હોય,તો $\tan A \tan B \tan C=$

  • A
    $0$
  • B
    $\tan D$
  • C
    $\cot D$
  • D
    $-\tan D$

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