यदि $A + B + C = 180^\circ$ है,तो $\sum \tan \frac{A}{2} \tan \frac{B}{2} = $

  • A
    $0$
  • B
    $1$
  • C
    $2$
  • D
    $3$

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$\sin 12^\circ \sin 48^\circ \sin 54^\circ = $

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