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?

  • A
    $t^2+(1-a) \sqrt{3} t+a=0$
  • B
    $\sqrt{3} t^2+(1-a) t+a \sqrt{3}=0$
  • C
    $\sqrt{3} t^2+(a-1) t+a \sqrt{3}=0$
  • D
    $t^2+(a-1) \sqrt{3} t+a=0$

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પદાવલિ $\cos^2 \phi + \cos^2(\theta + \phi) - 2 \cos \theta \cos \phi \cos(\theta + \phi)$ એ

કિંમત શોધો: $\sin ^2 18^{\circ}+\sin ^2 24^{\circ}+\sin ^2 36^{\circ}+\sin ^2 42^{\circ}+\sin ^2 78^{\circ}+\sin ^2 90^{\circ}+\sin ^2 96^{\circ}+\sin ^2 102^{\circ}+\sin ^2 138^{\circ}+\sin ^2 162^{\circ}$

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