જો $\sec (\theta+\alpha), \sec \theta$ અને $\sec (\theta-\alpha)$ સમાંતર શ્રેણીમાં હોય,તો $\sin ^2 \theta=$

  • A
    $\cos \alpha$
  • B
    $2 \cos \alpha$
  • C
    $-2 \cos \alpha$
  • D
    $-\cos \alpha$

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Similar Questions

જો $\operatorname{cosec} \theta = \frac{p+q}{p-q}$ હોય,તો $\cot \left(\frac{\pi}{4} + \frac{\theta}{2}\right)$ ની કિંમત શોધો.

$\frac{\cot A}{1-\tan A} + \frac{\tan A}{1-\cot A} = ?$

$\sqrt{3} \operatorname{cosec} 20^{\circ} - \sec 20^{\circ}$ ની કિંમત શોધો.

જો $f(x) = \frac{\cot x}{1 + \cot x}$ અને $\alpha + \beta = \frac{5 \pi}{4}$ હોય,તો $f(\alpha) f(\beta)$ ની કિંમત શોધો.

$\tan 9^{\circ}-\tan 27^{\circ}-\tan 63^{\circ}+\tan 81^{\circ}=$

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