Determine all values of $x$ in the interval $0 \leq x \leq 2\pi$ which satisfy the inequality \[ 2 \cos{x} \leq \sqrt{1+\sin{2x}}-\sqrt{1-\sin{2x}} \leq \sqrt{2}.  \]
1. **Initial Inequality Analysis**:
   We start with the given inequality:
   \[
   2 \cos{x} \leq \sqrt{1+\sin{2x}} - \sqrt{1-\sin{2x}} \leq \sqrt{2}.
   \]

2. **Upper Bound Analysis**:
   Consider the upper bound:
   \[
   \sqrt{1+\sin{2x}} - \sqrt{1-\sin{2x}} \leq \sqrt{2}.
   \]
   Since the maximum value of \(\sin{2x}\) is 1 and the minimum value is -1, we have:
   \[
   \sqrt{1+\sin{2x}} \leq \sqrt{2} \quad \text{and} \quad \sqrt{1-\sin{2x}} \leq \sqrt{2}.
   \]
   Therefore, the maximum value of \(\sqrt{1+\sin{2x}} - \sqrt{1-\sin{2x}}\) is \(\sqrt{2}\) when \(\sin{2x} = 1\) or \(\sin{2x} = -1\). Thus, the upper bound \(\sqrt{2}\) is always satisfied.

3. **Lower Bound Analysis**:
   Consider the lower bound:
   \[
   2 \cos{x} \leq \sqrt{1+\sin{2x}} - \sqrt{1-\sin{2x}}.
   \]
   To simplify, assume \(2 \cos{x} \geq 0\) (i.e., \(\cos{x} \geq 0\)). Then, we can square both sides:
   \[
   (2 \cos{x})^2 \leq \left(\sqrt{1+\sin{2x}} - \sqrt{1-\sin{2x}}\right)^2.
   \]
   This simplifies to:
   \[
   4 \cos^2{x} \leq (1+\sin{2x}) + (1-\sin{2x}) - 2\sqrt{(1+\sin{2x})(1-\sin{2x})}.
   \]
   Simplifying further:
   \[
   4 \cos^2{x} \leq 2 - 2\sqrt{1 - \sin^2{2x}}.
   \]
   Since \(\sin^2{2x} = 1 - \cos^2{2x}\), we have:
   \[
   4 \cos^2{x} \leq 2 - 2|\cos{2x}|.
   \]
   Using the double-angle formula \(\cos{2x} = 2 \cos^2{x} - 1\), we get:
   \[
   4 \cos^2{x} \leq 2 - 2|2 \cos^2{x} - 1|.
   \]
   Consider two cases for \(|2 \cos^2{x} - 1|\):

   - **Case 1**: \(2 \cos^2{x} - 1 \geq 0\) (i.e., \(\cos^2{x} \geq \frac{1}{2}\)):
     \[
     4 \cos^2{x} \leq 2 - 2(2 \cos^2{x} - 1) = 4 - 4 \cos^2{x}.
     \]
     Adding \(4 \cos^2{x}\) to both sides:
     \[
     8 \cos^2{x} \leq 4 \implies \cos^2{x} \leq \frac{1}{2} \implies \cos{x} \leq \frac{\sqrt{2}}{2}.
     \]

   - **Case 2**: \(2 \cos^2{x} - 1 < 0\) (i.e., \(\cos^2{x} < \frac{1}{2}\)):
     \[
     4 \cos^2{x} \leq 2 - 2(1 - 2 \cos^2{x}) = 2 - 2 + 4 \cos^2{x} = 4 \cos^2{x}.
     \]
     This is always true.

4. **Combining Results**:
   From the above cases, we conclude that:
   \[
   \cos{x} \leq \frac{\sqrt{2}}{2}.
   \]
   This corresponds to the interval:
   \[
   x \in \left[\frac{\pi}{4}, \frac{7\pi}{4}\right].
   \]

The final answer is \( \boxed{ x \in \left[\frac{\pi}{4}, \frac{7\pi}{4}\right] } \).