Find all real solutions $(x,y,z)$ of the system of equations:
\[
\begin{cases}
 \tan ^2x+2\cot^22y=1 \\ 
 \tan^2y+2\cot^22z=1  \\
  \tan^2z+2\cot^22x=1  \\
\end{cases}
\]
1. We start with the given system of equations:
   \[
   \begin{cases}
   \tan^2 x + 2 \cot^2 2y = 1 \\
   \tan^2 y + 2 \cot^2 2z = 1 \\
   \tan^2 z + 2 \cot^2 2x = 1
   \end{cases}
   \]

2. Using the identity for cotangent, $\cot 2y = \frac{1 - \tan^2 y}{2 \tan y}$, we substitute into the first equation:
   \[
   \tan^2 x + 2 \left( \frac{1 - \tan^2 y}{2 \tan y} \right)^2 = 1
   \]
   Simplifying the expression inside the parentheses:
   \[
   \tan^2 x + 2 \left( \frac{1 - \tan^2 y}{2 \tan y} \right)^2 = \tan^2 x + \frac{(1 - \tan^2 y)^2}{2 \tan^2 y} = 1
   \]
   Multiplying through by $2 \tan^2 y$ to clear the fraction:
   \[
   2 \tan^2 x \tan^2 y + (1 - \tan^2 y)^2 = 2 \tan^2 y
   \]

3. Letting $\tan^2 x = a$, $\tan^2 y = b$, and $\tan^2 z = c$, we rewrite the system as:
   \[
   \begin{cases}
   2ab + (1 - b)^2 = 2b \\
   2bc + (1 - c)^2 = 2c \\
   2ca + (1 - a)^2 = 2a
   \end{cases}
   \]

4. Simplifying each equation:
   \[
   2ab + 1 - 2b + b^2 = 2b \implies 2ab + b^2 - 4b + 1 = 0
   \]
   \[
   2bc + 1 - 2c + c^2 = 2c \implies 2bc + c^2 - 4c + 1 = 0
   \]
   \[
   2ca + 1 - 2a + a^2 = 2a \implies 2ca + a^2 - 4a + 1 = 0
   \]

5. Adding the three equations:
   \[
   (a^2 + b^2 + c^2) + 2(ab + bc + ca) - 4(a + b + c) + 3 = 0
   \]
   This can be rewritten as:
   \[
   (a + b + c)^2 - 4(a + b + c) + 3 = 0
   \]

6. Let $s = a + b + c$. Then:
   \[
   s^2 - 4s + 3 = 0
   \]
   Solving this quadratic equation:
   \[
   s = \frac{4 \pm \sqrt{16 - 12}}{2} = \frac{4 \pm 2}{2}
   \]
   \[
   s = 3 \quad \text{or} \quad s = 1
   \]

7. Case 1: $a + b + c = 1$
   \[
   a = b = c = \frac{1}{3}
   \]
   Substituting $a = b = c = \frac{1}{3}$ into the original equations, we verify that they satisfy the system.

8. Case 2: $a + b + c = 3$
   \[
   a = b = c = 1
   \]
   Substituting $a = b = c = 1$ into the original equations, we verify that they satisfy the system.

The final answer is $\boxed{(x, y, z) = \left(\frac{\pi}{6}, \frac{\pi}{6}, \frac{\pi}{6}\right) \text{ or } \left(\frac{\pi}{4}, \frac{\pi}{4}, \frac{\pi}{4}\right)}$