કિંમત શોધો: $\cos^2 48^\circ - \sin^2 12^\circ$

  • A
    $\frac{\sqrt{5} - 1}{4}$
  • B
    $\frac{\sqrt{5} + 1}{8}$
  • C
    $\frac{\sqrt{3} - 1}{4}$
  • D
    $\frac{\sqrt{3} + 1}{2\sqrt{2}}$

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જો બે ખૂણાઓ $\alpha, \beta$ એવા હોય કે $0 < \alpha, \beta < \frac{\pi}{4}$,$\sqrt{1+\cos 2 \alpha}=\frac{3}{\sqrt{5}}$ અને $\frac{\sqrt{1-\cos 2 \beta}}{\sqrt{1+\cos 2 \beta}}=\frac{1}{7}$,તો $(2 \alpha+\beta)=$

જો $\cos (\alpha + \beta ) = \frac{4}{5}$,$\sin (\alpha - \beta ) = \frac{5}{13}$ અને $\alpha, \beta$ એ $0$ અને $\frac{\pi}{4}$ ની વચ્ચે હોય,તો $\tan 2\alpha = $

$\cos A + \cos (240^\circ + A) + \cos (240^\circ - A) = $

$\tan 100^\circ + \tan 125^\circ + \tan 100^\circ \tan 125^\circ = $

$\frac{1}{4} [\sqrt{3} \cos 23^\circ - \sin 23^\circ] = $

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