Simplify Me!

Algebra Level pending

\[ \frac {1}{a^2 + ax + x^2 } - \frac 1{a^2 -ax+x^2 } + \frac {2ax}{a^4 +a^2 x^2 + x^4 } \]

If none of the denominators of the three fractions in the expression above are equals to zero, what is the value of the expression?

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