यदि $\frac{1}{2}\left(\tan \left(\frac{\pi}{24}\right)+\cot \left(\frac{\pi}{24}\right)\right)=\sqrt{a^2+a}+\sqrt{a}$ है,तो $a=$

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

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