यदि $\tanh(x) = \frac{1}{3}$ है,तो $\tanh(3x)$ का मान क्या होगा?

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

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