यदि $x = \cos 10^\circ \cos 20^\circ \cos 40^\circ$ है,तो $x$ का मान क्या है?

  • A
    $\frac{1}{4}\tan 10^\circ $
  • B
    $\frac{1}{8}\cot 10^\circ $
  • C
    $\frac{1}{8}\csc 10^\circ $
  • D
    $\frac{1}{8}\sec 10^\circ $

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