જો $\sin \theta + \sin \phi = a$ અને $\cos \theta + \cos \phi = b$ હોય,તો $\tan \frac{\theta - \phi}{2}$ ની કિંમત શોધો.

  • A
    $\sqrt{\frac{a^2 + b^2}{4 - a^2 - b^2}}$
  • B
    $\sqrt{\frac{4 - a^2 - b^2}{a^2 + b^2}}$
  • C
    $\sqrt{\frac{a^2 + b^2}{4 + a^2 + b^2}}$
  • D
    $\sqrt{\frac{4 + a^2 + b^2}{a^2 + b^2}}$

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જો $\frac{5 \sinh 2x}{7+6 \cosh 2x} = \frac{3}{2}$ હોય,તો $3 \tanh^2 x + 20 \tanh x = $

ધારો કે $\theta$ અને $\phi \neq 0$ એવા છે કે જેથી $\sec(\theta + \phi)$,$\sec \theta$,અને $\sec(\theta - \phi)$ એ $A.P.$ માં છે. જો $\cos \theta = k \cos(\frac{\phi}{2})$ કોઈ $k$ માટે હોય,તો $k$ ની કિંમત શોધો.

$\tan 6^{\circ} \tan 42^{\circ} \tan 66^{\circ} \tan 78^{\circ} = $

જો $x: y: z = \tan \left(\frac{\pi}{15}+\alpha\right): \tan \left(\frac{\pi}{15}+\beta\right): \tan \left(\frac{\pi}{15}+\gamma\right)$ હોય,તો $\frac{z+x}{z-x} \sin ^2(\gamma-\alpha)+\frac{x+y}{x-y} \sin ^2(\alpha-\beta)+\frac{y+z}{y-z} \sin ^2(\beta-\gamma)$ ની કિંમત શોધો.

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