जब फलन $f(x) = 2(\cos 3x + \cos \sqrt{3} x)$ अपना अधिकतम मान प्राप्त करता है,तो $x$ के मानों की संख्या क्या है?

  • A
    $1$
  • B
    $2$
  • C
    $0$
  • D
    अनंत

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