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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$4 \cos \frac{\pi}{7} \cos \frac{\pi}{5} \cos \frac{2 \pi}{7} \cos \frac{2 \pi}{5} \cos \frac{4 \pi}{7} = $

જો $0 < \theta < \frac{\pi}{2}$ અને $\tan 3 \theta \neq 0$ હોય, તો $\tan \theta + \tan 2 \theta + \tan 3 \theta = 0$ થાય જો $\tan \theta \cdot \tan 2 \theta = k$ હોય, જ્યાં $k =$

જો $\tan A - \tan B = x$ અને $\cot A - \cot B = y$ હોય,તો $\cot (A - B) =$

$\sin \frac{2 \pi}{5}+\sin \frac{4 \pi}{5}+\sin \frac{6 \pi}{5}+\sin \frac{8 \pi}{5}$ ની કિંમત શોધો.

જો $A$ અને $B$ ધન લઘુકોણ હોય જે $3 \cos^2 A + 2 \cos^2 B = 4$ અને $\frac{3 \sin A}{\sin B} = \frac{2 \cos B}{\cos A}$ નું સમાધાન કરે છે,તો $A + 2B =$ ($^{\circ}$ માં)

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