$\sin 12^\circ \sin 24^\circ \sin 48^\circ \sin 84^\circ = $

  • A
    $\cos 20^\circ \cos 40^\circ \cos 60^\circ \cos 80^\circ $
  • B
    $\sin 20^\circ \sin 40^\circ \sin 60^\circ \sin 80^\circ $
  • C
    $\frac{3}{15}$
  • D
    આમાંથી કોઈ નહીં

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જો $\cot x \cot y = a$ અને $x+y = \frac{\pi}{6}$ હોય,તો $\cot x$ અને $\cot y$ ના બીજ ધરાવતું દ્વિઘાત સમીકરણ કયું છે?

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