જો $\tanh ^2 x = \tan ^2 \theta$ હોય,તો $\cosh 2x =$

  • A
    $\cos \theta$
  • B
    $\sin \theta$
  • C
    $\cos 2\theta$
  • D
    $\sec 2\theta$

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જો $\tan^2 \alpha \tan^2 \beta + \tan^2 \beta \tan^2 \gamma + \tan^2 \gamma \tan^2 \alpha + 2\tan^2 \alpha \tan^2 \beta \tan^2 \gamma = 1$ હોય,તો $\sin^2 \alpha + \sin^2 \beta + \sin^2 \gamma$ નું મૂલ્ય શોધો.

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$\tan \frac{\pi}{5}+2 \tan \frac{2 \pi}{5}+4 \cot \frac{4 \pi}{5}$ ની કિંમત શોધો.

જો $\sin A + \sin B = \frac{1}{2}$ અને $\cos A + \cos B = 1$ હોય,તો $\sin \left(\frac{A-B}{2}\right)$ ની કિંમત શોધો.

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