જો $\sin 18^{\circ} = \frac{\sqrt{5}-1}{4}$ હોય,તો $\cos ^2 48^{\circ} - \sin ^2 12^{\circ}$ ની કિંમત શોધો.

  • A
    $\frac{-\sqrt{5}+1}{8}$
  • B
    $\frac{\sqrt{5}-1}{8}$
  • C
    $\frac{\sqrt{5}+1}{8}$
  • D
    $\frac{-1-\sqrt{5}}{8}$

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જો $\cos (\theta - \alpha ), \cos \theta$ અને $\cos (\theta + \alpha )$ એ $H.P.$ માં હોય,તો $\cos \theta \sec \frac{\alpha }{2}$ ની કિંમત શોધો.

$\tan \frac{\pi}{5} + 2 \tan \frac{2 \pi}{5} + 4 \cot \frac{4 \pi}{5}$ નું મૂલ્ય શું છે?

${e^{\log_{10} \tan 1^\circ + \log_{10} \tan 2^\circ + \log_{10} \tan 3^\circ + \dots + \log_{10} \tan 89^\circ}}$ ની કિંમત શોધો.

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