$\cos 41^{\circ} \cdot \cos 42^{\circ} \cdot \cos 43^{\circ} \cdot \cos 44^{\circ} \cdot \cos 45^{\circ} \cdot \cos 46^{\circ} \cdot \cos 47^{\circ} \cdot \cos 48^{\circ} \cdot \cos 49^{\circ}$ ની કિંમત શોધો.

  • A
    $\frac{1}{\sqrt{2}}$
  • B
    $1$
  • C
    $0$
  • D
    $\frac{\sqrt{3}}{2}$

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સમીકરણ $\sec^2 \theta = \frac{4xy}{(x + y)^2}$ માત્ર ત્યારે જ શક્ય છે જ્યારે

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