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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$\cot x - \tan x = $

यदि $\tan \theta \cdot \tan 2 \theta = 1$ है,तो $\sin ^{2} 2 \theta + \tan ^{2} 2 \theta$ का मान ज्ञात कीजिए।

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