જો $x + \frac{1}{x} = 2\cos \theta ,$ હોય,તો ${x^3} + \frac{1}{{{x^3}}} = $

  • A
    $\cos 3\theta $
  • B
    $2\cos 3\theta $
  • C
    $\frac{1}{2}\cos 3\theta $
  • D
    $\frac{1}{3}\cos 3\theta $

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જો $3\cos \theta + 4\sin \theta = 5$ હોય,તો $3\sin \theta - 4\cos \theta$ ની કિંમત શોધો.

જો $\theta$ એ લઘુકોણ હોય અને $\tan \theta + \cot \theta = 2$ હોય,તો $\tan^{5} \theta + \cot^{5} \theta$ ની કિંમત શોધો.

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