$\cos(18^{\circ}-A) \cos(18^{\circ}+A) - \cos(72^{\circ}-A) \cos(72^{\circ}+A)$ ની કિંમત શોધો.

  • A
    $\cos 54^{\circ}$
  • B
    $\cos 36^{\circ}$
  • C
    $\sin 54^{\circ}$
  • D
    $\sin 36^{\circ}$

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જો $\sin \alpha = 1/\sqrt{5}$ અને $\sin \beta = 3/5$ હોય,તો $\beta - \alpha$ કયા અંતરાલમાં આવે છે?

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$\frac{\sin(B + A) + \cos(B - A)}{\sin(B - A) + \cos(B + A)} = $

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 $\tan 2 \alpha$ ની કિંમત શોધો.

$\frac{\cos 9^\circ + \sin 9^\circ}{\cos 9^\circ - \sin 9^\circ} = $

જો $\cos \theta = \frac{3}{5}$ અને $\cos \phi = \frac{4}{5}$ હોય,જ્યાં $\theta$ અને $\phi$ ધન લઘુકોણ છે,તો $\cos \frac{\theta - \phi}{2} = $

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