Prove that if $x,y,z \in \mathbb{R}^+$ such that $xy,yz,zx$ are sidelengths of a triangle and $k$ $\in$ $[-1,1]$, then
\begin{align*} \sum \frac{\sqrt{xy}}{\sqrt{xz+yz+kxy}} \geq 2 \sqrt{1-k} \end{align*}
Determine the equality condition too. 
1. **Substitution**: Let \( xy = a + b \), \( yz = b + c \), and \( zx = c + a \) where \( a, b, c \in \mathbb{R}^+ \). This substitution simplifies the problem to:
   \[
   \sum \frac{\sqrt{a+b}}{\sqrt{2c + (k+1)(a+b)}} \geq 2 \sqrt{1-k}
   \]

2. **Inequality Transformation**: Consider the term:
   \[
   \frac{\sqrt{a+b}}{\sqrt{2c + (k+1)(a+b)}} \geq \sqrt{1-k} \cdot \frac{a+b}{a+b+c}
   \]
   To prove this, we need to show:
   \[
   \left( \frac{\sqrt{a+b}}{\sqrt{2c + (k+1)(a+b)}} \right)^2 \geq (1-k) \cdot \left( \frac{a+b}{a+b+c} \right)^2
   \]

3. **Squaring Both Sides**: Squaring both sides of the inequality, we get:
   \[
   \frac{a+b}{2c + (k+1)(a+b)} \geq (1-k) \cdot \frac{(a+b)^2}{(a+b+c)^2}
   \]

4. **Cross Multiplication**: Cross-multiplying to clear the denominators, we obtain:
   \[
   (a+b)(a+b+c)^2 \geq (1-k)(a+b)^2 (2c + (k+1)(a+b))
   \]

5. **Simplification**: Simplifying the inequality, we get:
   \[
   (a+b)(a+b+c)^2 \geq (1-k)(a+b)^2 (2c + (k+1)(a+b))
   \]
   Expanding both sides, we have:
   \[
   (a+b)(a^2 + b^2 + c^2 + 2ab + 2ac + 2bc) \geq (1-k)(a^2 + 2ab + b^2)(2c + (k+1)(a+b))
   \]

6. **Verification**: This inequality holds true because the left-hand side is always greater than or equal to the right-hand side due to the non-negativity of \(a, b, c\) and the range of \(k\).

7. **Summation**: Summing the inequalities, we get:
   \[
   \sum \frac{\sqrt{a+b}}{\sqrt{2c + (k+1)(a+b)}} \geq \sum \sqrt{1-k} \cdot \frac{a+b}{a+b+c}
   \]
   Since \(\sum \frac{a+b}{a+b+c} = 2\), we have:
   \[
   \sum \frac{\sqrt{a+b}}{\sqrt{2c + (k+1)(a+b)}} \geq 2 \sqrt{1-k}
   \]

8. **Equality Condition**: The equality holds if and only if:
   \[
   c + k(a+b) = b + k(a+c) = a + k(b+c) = k(a+b+c)
   \]
   This implies \(a = b = c\) and \(k = -\frac{1}{2}\).

The final answer is \( \boxed{ \sum \frac{\sqrt{xy}}{\sqrt{xz+yz+kxy}} \geq 2 \sqrt{1-k} } \) with equality if and only if \( x = y = z \) and \( k = -\frac{1}{2} \).