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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यदि $\frac{2\sin \alpha}{1 + \cos \alpha + \sin \alpha} = y$ है,तो $\frac{1 - \cos \alpha + \sin \alpha}{1 + \sin \alpha} = $

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

$(1+\sec 2\theta)(1+\sec 4\theta) = $

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