यदि $\tan 80^{\circ} = a$ और $\tan 47^{\circ} = b$ है,तो $\tan 37^{\circ}$ का मान क्या होगा?

  • A
    $\frac{a - b}{1 + ab}$
  • B
    $\frac{ab + 1}{a - b}$
  • C
    $\frac{ab - 1}{a + b}$
  • D
    $\frac{a + b}{1 - ab}$

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