જો $m \cos (\alpha+\beta)-n \cos (\alpha-\beta)=m \cos (\alpha-\beta)+n \cos (\alpha+\beta)$ હોય,તો $\tan \alpha \tan \beta=$

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

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જો $\tan \theta = \frac{\sin \alpha - \cos \alpha}{\sin \alpha + \cos \alpha}$ અને $0 \leq \alpha \leq \frac{\pi}{2}$ હોય,તો $\cos 2 \theta$ ની કિંમત શોધો.

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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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