$\tan \left( \frac{\pi }{4} + \theta \right) - \tan \left( \frac{\pi }{4} - \theta \right) = $

  • A
    $2\tan 2\theta $
  • B
    $2\cot 2\theta $
  • C
    $\tan 2\theta $
  • D
    $\cot 2\theta $

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एक त्रिभुज $ABC$ में,यदि $A = \frac{\pi}{4}$ और $\tan B \tan C = K$ है,तो $K$ को किस शर्त को संतुष्ट करना चाहिए?

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$\sqrt {\frac{{1 - \sin A}}{{1 + \sin A}}} = $

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