જો $\sqrt{\frac{1+\cos A}{1-\cos A}}=\frac{x}{y}$ હોય,તો $\tan A$ ની કિંમત કેટલી થાય?

  • 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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જો $\tanh(x) = \frac{1}{3}$ હોય,તો $\tanh(3x)$ ની કિંમત શોધો.

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