यदि $\cos \theta = \frac{x^{2}-y^{2}}{x^{2}+y^{2}}$ है,तो $\cot \theta$ का मान ज्ञात कीजिए (जहाँ $0^{\circ} \leq \theta \leq 90^{\circ}$)

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

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यदि $x + \frac{1}{x} = 2\cos \alpha$ है, तो ${x^n} + \frac{1}{{{x^n}}} = $

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