જો $\tan \alpha = \frac{1}{7}$ અને $\sin \beta = \frac{1}{\sqrt{10}}$ જ્યાં $0 < \alpha, \beta < \frac{\pi}{2}$ હોય,તો $2\beta$ ની કિંમત શોધો.

  • A
    $\frac{\pi}{4} - \alpha$
  • B
    $\frac{3\pi}{4} - \alpha$
  • C
    $\frac{\pi}{8} - \frac{\alpha}{2}$
  • D
    $\frac{3\pi}{8} - \frac{\alpha}{2}$

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$\frac{1 + \sin A - \cos A}{1 + \sin A + \cos A} = $

જો $\tan x = \frac{3}{4}$ અને $\pi < x < \frac{3\pi}{2}$ હોય,તો $\cos \frac{x}{2}$ ની કિંમત શોધો.

જો $\cot \frac{2x}{3} + \tan \frac{x}{3} = \operatorname{cosec} \frac{kx}{3}$ હોય, તો $k$ ની કિંમત શોધો.

જો $\cos \theta = \frac{1}{2}\left( a + \frac{1}{a} \right)$ હોય,તો $\cos 3\theta$ ની કિંમત શોધો.

$\cos x \cdot \cos 7 x - \cos 5 x \cdot \cos 13 x = $

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