$\triangle ABC$ માં,જો $a=5$ અને $\tan \frac{A-B}{2}=\frac{1}{4} \tan \frac{A+B}{2}$ હોય,તો $\sqrt{a^2-b^2}=$

  • A
    $2$
  • B
    $3$
  • C
    $4$
  • D
    $5$

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$\triangle ABC$ માં,જો $a=13, b=14$ અને $\cos \frac{C}{2}=\frac{3}{\sqrt{13}}$ હોય,તો $2r_1=$

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