જો $\cos 43^{\circ} + \sin 43^{\circ} = k$ હોય, તો $\cos 2^{\circ}$ ની કિંમત શોધો.

  • A
    $\frac{k}{\sqrt{2}}$
  • B
    $\frac{\sqrt{2}}{k}$
  • C
    $\frac{\sqrt{2}}{k\sqrt{3}}$
  • D
    $\frac{k}{\sqrt{3}}$

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ધારો કે $\tan \alpha = \frac{a}{a+1}$ અને $\tan \beta = \frac{1}{2a+1}$, તો $\alpha + \beta$ શું થાય?

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

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

જો $A + C = B$ હોય,તો $\tan A \tan B \tan C = $

$\sin 75^\circ = $

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