જો $3 \sin^{2} x - 8 \sin x + 4 = 0$ અને $x \in \left(\frac{\pi}{2}, \pi\right)$ હોય,તો $\tan x = $

  • A
    $-\frac{\sqrt{5}}{2}$
  • B
    $\frac{2}{\sqrt{5}}$
  • C
    $-\frac{2}{\sqrt{5}}$
  • D
    $\frac{\sqrt{5}}{2}$

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$\frac{1}{\sin 1^{\circ} \sin 2^{\circ}}+\frac{1}{\sin 2^{\circ} \sin 3^{\circ}}+\frac{1}{\sin 3^{\circ} \sin 4^{\circ}}+\ldots+\frac{1}{\sin 89^{\circ} \sin 90^{\circ}} = ?$

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