જો $\sqrt x + \frac{1}{{\sqrt x }} = 2\cos \theta$ હોય,તો ${x^6} + {x^{ - 6}} = $

  • A
    $2\cos 6\theta $
  • B
    $2 \cos 12\theta$
  • C
    $2\cos 3\theta $
  • D
    $2\sin 3\theta $

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જો $\tan A + \cot A = 4$ હોય,તો ${\tan ^4}A + {\cot ^4}A$ ની કિંમત કેટલી થાય?

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જો $y = (1 + \tan A)(1 - \tan B)$ જ્યાં $A - B = \frac{\pi}{4}$ હોય,તો $(y + 1)^{y + 1}$ ની કિંમત કેટલી થાય?

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$\sin 4\theta$ ને કેવી રીતે લખી શકાય?

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