Find values of the parameter $u$ for which the expression 
\[y = \frac{ \tan(x-u) + \tan(x) + \tan(x+u)}{ \tan(x-u)\tan(x)\tan(x+u)}\] 
does not depend on $x.$
To find the values of the parameter \( u \) for which the expression 
\[ y = \frac{\tan(x-u) + \tan(x) + \tan(x+u)}{\tan(x-u)\tan(x)\tan(x+u)} \]
does not depend on \( x \), we need to simplify the given expression and analyze the conditions under which the \( x \)-dependence cancels out.

1. **Simplify the numerator and denominator:**
   Let's denote:
   \[ A = \tan(x-u), \quad B = \tan(x), \quad C = \tan(x+u) \]
   The expression becomes:
   \[ y = \frac{A + B + C}{ABC} \]

2. **Use the tangent addition formula:**
   Recall the tangent addition formula:
   \[ \tan(a \pm b) = \frac{\tan a \pm \tan b}{1 \mp \tan a \tan b} \]
   Applying this to \( \tan(x+u) \) and \( \tan(x-u) \):
   \[ \tan(x+u) = \frac{\tan x + \tan u}{1 - \tan x \tan u} = \frac{B + \tan u}{1 - B \tan u} \]
   \[ \tan(x-u) = \frac{\tan x - \tan u}{1 + \tan x \tan u} = \frac{B - \tan u}{1 + B \tan u} \]

3. **Substitute back into the expression:**
   Substitute \( A \) and \( C \) back into the expression for \( y \):
   \[ y = \frac{\frac{B - \tan u}{1 + B \tan u} + B + \frac{B + \tan u}{1 - B \tan u}}{\left(\frac{B - \tan u}{1 + B \tan u}\right) B \left(\frac{B + \tan u}{1 - B \tan u}\right)} \]

4. **Simplify the numerator:**
   Combine the terms in the numerator:
   \[ \frac{B - \tan u}{1 + B \tan u} + B + \frac{B + \tan u}{1 - B \tan u} \]
   To combine these fractions, find a common denominator:
   \[ \frac{(B - \tan u)(1 - B \tan u) + B(1 + B \tan u)(1 - B \tan u) + (B + \tan u)(1 + B \tan u)}{(1 + B \tan u)(1 - B \tan u)} \]

5. **Simplify the denominator:**
   Simplify the product in the denominator:
   \[ \left(\frac{B - \tan u}{1 + B \tan u}\right) B \left(\frac{B + \tan u}{1 - B \tan u}\right) = \frac{(B - \tan u) B (B + \tan u)}{(1 + B \tan u)(1 - B \tan u)} \]
   \[ = \frac{B^3 - B \tan^2 u}{1 - B^2 \tan^2 u} \]

6. **Combine and simplify:**
   The expression for \( y \) becomes:
   \[ y = \frac{(B - \tan u)(1 - B \tan u) + B(1 + B \tan u)(1 - B \tan u) + (B + \tan u)(1 + B \tan u)}{(B^3 - B \tan^2 u)} \]

7. **Analyze the conditions for \( y \) to be independent of \( x \):**
   For \( y \) to be independent of \( x \), the numerator must simplify to a form that does not involve \( B \). This happens when the coefficients of \( B \) cancel out. 

   After simplifying, we find that:
   \[ 2 + 4 \cos 2u = 0 \]
   Solving for \( u \):
   \[ \cos 2u = -\frac{1}{2} \]
   \[ 2u = 2k\pi \pm \frac{2\pi}{3} \]
   \[ u = k\pi \pm \frac{\pi}{3} \]

The final answer is \( \boxed{ u = k\pi \pm \frac{\pi}{3} } \) for integers \( k \).