यदि $\sqrt{\frac{1+\cos A}{1-\cos A}}=\frac{x}{y}$ है,तो $\tan A$ का मान किसके बराबर है?

  • A
    $\frac{x^{2}+y^{2}}{x^{2}-y^{2}}$
  • B
    $\frac{2xy}{x^{2}+y^{2}}$
  • C
    $\frac{2xy}{x^{2}-y^{2}}$
  • D
    $\frac{2xy}{y^{2}-x^{2}}$

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$\tan \alpha + 2 \tan 2 \alpha + 4 \tan 4 \alpha + 8 \cot 8 \alpha = $

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