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

  • A
    $\frac{8}{9}$
  • B
    $\frac{7}{9}$
  • C
    $1$
  • D
    $\frac{2}{3}$

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