यदि $90^\circ < A < 180^\circ$ और $\sin A = \frac{4}{5}$ है,तो $\tan \frac{A}{2}$ का मान ज्ञात कीजिए।

  • A
    $1/2$
  • B
    $3/5$
  • C
    $3/2$
  • D
    $2$

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यदि $\sin A + \cos A = \sqrt{2}$ है,तो $\cos^2 A = $

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