જો $x = \cos 10^\circ \cos 20^\circ \cos 40^\circ$ હોય,તો $x$ નું મૂલ્ય શું થાય?

  • 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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