જો $2\cos^2 \theta - 2\sin^2 \theta = 1$ હોય,તો $\theta = \dots ^\circ$.

  • A
    $15$
  • B
    $30$
  • C
    $45$
  • D
    $60$

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સાબિત કરો કે $\tan 4x = \frac{4 \tan x (1 - \tan^2 x)}{1 - 6 \tan^2 x + \tan^4 x}$.

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

જો $\cos A = \frac{3}{4}$ હોય,તો $32\sin \left( \frac{A}{2} \right)\sin \left( \frac{5A}{2} \right) = $

જો $\cos \theta = \frac{-3}{5}$ અને $\pi < \theta < \frac{3 \pi}{2}$ હોય,તો $\tan \left(\frac{\theta}{2}\right) = $

$\sqrt{2} + \sqrt{3} + \sqrt{4} + \sqrt{6}$ ની કિંમત શોધો.

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