જો $\frac{1+\cos A}{1-\cos A}=\frac{m^{2}}{n^{2}}$ હોય,તો $\tan A=$

  • A
    $\pm \frac{2mn}{m^{2}+n^{2}}$
  • B
    $\pm \frac{2mn}{m^{2}-n^{2}}$
  • C
    $\frac{m^{2}+n^{2}}{m^{2}-n^{2}}$
  • D
    આમાંથી કોઈ નહીં

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