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JEE Math Practice Question

Let the range of the function $$f(x)=\frac{1}{2+\sin 3 x+\cos 3 x}, x \in \mathbb{R}$$ be $$[a, b]$$. If $$\alpha$$ and $$\beta$$ ar respectively the A.M. and the G.M. of $$a$$ and $$b$$, then $$\frac{\alpha}{\beta}$$ is equal to

  1. A.$$\pi$$
  2. B.$$\sqrt{\pi}$$
  3. C.$$\sqrt{2}$$
  4. D.2

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