Substitute Eq. (6.2.14) for (hat{phi}_{s}(mathbf{x})) and (hat{pi}_{s}(mathbf{x})) into Eq. (6.2.16) and hence show that the expressions given

Question:

Substitute Eq. (6.2.14) for $\hat{\phi}_{s}(\mathbf{x})$ and $\hat{\pi}_{s}(\mathbf{x})$ into Eq. (6.2.16) and hence show that the expressions given for the annihilation and creation operators, $\hat{a}_{\mathbf{p}}$ and $\hat{a}_{\mathbf{p}}^{\dagger}$, are correct.

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