$\cos ^4 x$ નું મૂલ્ય શું છે?

  • A
    $\frac{3}{8}+\frac{1}{2} \cos 2 x+\frac{1}{8} \cos 4 x$
  • B
    $\frac{3}{8}-\frac{1}{2} \cos 2 x+\frac{1}{8} \cos 4 x$
  • C
    $\frac{3}{8}-\frac{1}{8} \cos 4 x+\frac{1}{2} \cos 2 x$
  • D
    $\frac{1}{8} \cos 4 x+\frac{1}{2} \cos 2 x-\frac{3}{8}$

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$\cos A \cos 2 A \cos 4 A \ldots \cos 2^{n-1} A$ ની કિંમત શું થાય?

જો $\tan \theta = \frac{a}{b}$ હોય,તો $b \cos 2 \theta + a \sin 2 \theta = $

$\operatorname{cosec} 2 \theta - \cot 2 \theta = ?$

જો $\theta = \frac{\pi}{9}$ હોય,તો $1 + 27 \tan^2 \theta - 33 \tan^4 \theta + \tan^6 \theta = $

જો $\tan A = \frac{1 - \cos B}{\sin B}$ હોય,તો $\tan B$ ના પદમાં $\tan 2A$ શોધો.

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