यदि $3 \sin^{2} x - 8 \sin x + 4 = 0$ और $x \in \left(\frac{\pi}{2}, \pi\right)$ है,तो $\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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यदि $x=\log _e\left[\cot \left(\frac{\pi}{4}+\theta\right)\right]$ और $\theta \in\left(\frac{-\pi}{4}, \frac{\pi}{4}\right)$ है,तो निम्नलिखित कथनों पर विचार करें:
$I$ : $\cosh x=\sec 2 \theta$
$II$ : $\sinh x=-\tan 2 \theta$
तो निम्नलिखित में से कौन सा विकल्प सही है?

यदि $\sin \theta \cosh \alpha = \tan x$ और $\cos \theta \sinh \alpha = \sec x$ है,तो $\cos 2 \theta \cosh 2 \alpha$ का मान ज्ञात कीजिए।

यदि $\sinh x = \frac{12}{5}$ है,तो $\sinh 3x + \cosh 3x = $

यदि $\cos x + \cos y - \cos (x + y) = \frac{3}{2}$ है,तो

$\tan 6^{\circ} \tan 42^{\circ} \tan 66^{\circ} \tan 78^{\circ} = $

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