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**1. Homework Statement**

I need to take the derivative of this expression explicitly

**2. Homework Equations**

[tex]\partial_{\mu}Ae^{(-i/\hbar)x\bullet p}u(p)[/tex]

**3. The Attempt at a Solution**

I tried to take the derivative of it by taking the derivatives of components of the momentum four vector "p".

However, I got stuck while trying to recombine the expression left from derivation.

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