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If $a,b,c$ are the sides of $\Delta ABC$, then $\tan \frac{B-C}{2} \tan \frac{A}{2}$ is equal to

  1. $\frac{b+c}{b-c}$
  2. $\frac{b-c}{b+c}$
  3. $\frac{c-b}{c+b}$
  4. none of these
in Numerical Ability by Boss (17.5k points)
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