यदि $\tan \left( \frac{\pi }{4} + \theta \right) + \tan \left( \frac{\pi }{4} - \theta \right) = \lambda \sec 2\theta$ है,तो $\lambda$ =

  • A
    $3$
  • B
    $4$
  • C
    $1$
  • D
    $2$

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Similar Questions

यदि दो कोण $\alpha, \beta$ इस प्रकार हैं कि $0 < \alpha, \beta < \frac{\pi}{4}$,$\sqrt{1+\cos 2 \alpha}=\frac{3}{\sqrt{5}}$ और $\frac{\sqrt{1-\cos 2 \beta}}{\sqrt{1+\cos 2 \beta}}=\frac{1}{7}$,तो $(2 \alpha+\beta)=$

$\tan 75^\circ - \cot 75^\circ = $

$\tan 100^\circ + \tan 125^\circ + \tan 100^\circ \tan 125^\circ = $

सिद्ध कीजिए कि: $\sin x + \sin 3x + \sin 5x + \sin 7x = 4 \cos x \cos 2x \sin 4x$

$\cos 48^{\circ} \cdot \cos 12^{\circ} = ?$

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