જો $1+\sqrt{1+a}=(1+\sqrt{1-a}) \cot \alpha$ અને $0 < a < 1$ હોય,તો $\sin 4 \alpha=$

  • A
    $a$
  • B
    $2a$
  • C
    $3a$
  • D
    $4a$

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$\cos 20^{\circ} \cos 40^{\circ} \cos 60^{\circ} \cos 80^{\circ} = $

જો $x \neq -y$ અને $\sin x + \sin y = 3(\cos y - \cos x)$ હોય,તો $\tan(x - y) =$

જો $\tan A + \cot A = 4$ હોય,તો $\tan^4 A + \cot^4 A$ ની કિંમત કેટલી થાય?

$\sqrt{3} \csc 20^{\circ} - \sec 20^{\circ} = $

ધારો કે $S = \{x \in \left(-\frac{\pi}{2}, \frac{\pi}{2}\right) : 9^{1-\tan^2 x} + 9^{\tan^2 x} = 10\}$ અને $\beta = \sum_{x \in S} \tan^2\left(\frac{x}{3}\right)$,તો $\frac{1}{6}(\beta - 14)^2$ ની કિંમત શોધો.

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