$R$ से $R$ पर परिभाषित निम्नलिखित फलनों में से,अचर फलन कौन सा है?

  • A
    $\frac{3}{5+4 \sin 3x}$
  • B
    $\frac{1}{2-\cos 3x}$
  • C
    $\cos^2 x + \cos^2(x + \frac{\pi}{3}) - \cos x \cdot \cos(x + \frac{\pi}{3})$
  • D
    $\frac{15}{3 \sin x + 4 \cos x + 10}$

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