જો $\sin \theta = -\frac{4}{5}$ અને $\theta$ ત્રીજા ચરણમાં હોય,તો $\cos \frac{\theta}{2} = $

  • A
    $\frac{1}{\sqrt{5}}$
  • B
    $-\frac{1}{\sqrt{5}}$
  • C
    $\sqrt{\frac{2}{5}}$
  • D
    $-\sqrt{\frac{2}{5}}$

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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.

જો $\cos 3\theta = \alpha \cos \theta + \beta \cos^3 \theta$ હોય,તો $(\alpha, \beta) = $

$\frac{\cot x - \tan x}{\cot 2x}$ ની કિંમત શું છે?

જો $630^{\circ} < \theta < 810^{\circ}$ અને $\tan \theta = -\frac{7}{24}$ હોય,તો $\cos \left(\frac{\theta}{4}\right) = $

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