ત્રિકોણ $ABC$ માં,જો $b=7, c=4\sqrt{3}$ અને $A=\frac{\pi}{6}$ હોય,તો $a \sin B \sin C =$

  • A
    $\frac{\sqrt{13}}{12}$
  • B
    $\frac{\sqrt{13}}{7\sqrt{3}}$
  • C
    $\frac{12}{\sqrt{13}}$
  • D
    $\frac{7\sqrt{3}}{\sqrt{13}}$

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$\triangle ABC$ માં,જો $a \cos^2 \frac{C}{2} + c \cos^2 \frac{A}{2} = \frac{3b}{2}$ હોય,તો $a+c : b =$

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