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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$\tan \alpha + 2\tan 2\alpha + 4\tan 4\alpha + 8\cot 8\alpha = $

જો $\tan x + \tan \left( \frac{\pi}{3} + x \right) + \tan \left( \frac{2\pi}{3} + x \right) = 3$ હોય,તો

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

જો $\left(\frac{\sin 3 \theta}{\sin \theta}\right)^2-\left(\frac{\cos 3 \theta}{\cos \theta}\right)^2=a \cos b \theta$ હોય,તો $a: b=$

$\tan \frac{\pi}{8}$ ની કિંમત શોધો.

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