જો $\tan A = n \tan B$ અને $\sin A = m \sin B$ હોય,તો $\cos ^{2} A$ ની કિંમત શોધો.

  • A
    $\frac{m^{2}-1}{n^{2}-1}$
  • B
    $\frac{m^{2}+1}{n^{2}+1}$
  • C
    $\frac{m^{2}+1}{n^{2}-1}$
  • D
    $\frac{m^{2}-1}{n^{2}+1}$

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

જો $\sin x + \cos x = a$,$a \in [-\sqrt{2}, \sqrt{2}] - \{-1, 1\}$,હોય,તો $\sum_{n=1}^\infty (\sin^n x + \cos^n x)$ ની કિંમત શોધો.

જો $\tan \left( \frac{\pi}{4} + \theta \right) + \tan \left( \frac{\pi}{4} - \theta \right) = \lambda \sec 2\theta$ હોય,તો $\lambda$ =

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