यदि $\cosh x = \frac{5}{4}$ है,तो $\tanh 3x =$ क्या होगा?

  • A
    $\frac{63}{65}$
  • B
    $\frac{25}{26}$
  • C
    $\frac{65}{67}$
  • D
    $\frac{252}{265}$

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$\cos 20^\circ \cos 40^\circ \cos 80^\circ = $

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यदि $k = \sin \frac{\pi}{18} \cdot \sin \frac{5\pi}{18} \cdot \sin \frac{7\pi}{18}$ है,तो $k$ का संख्यात्मक मान क्या है?

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