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Let $\Phi(x,\theta,\bar{\theta})$ be a complex superfield. Let $K(\Phi,\bar{\Phi})$ be a function of $\Phi$ and $\bar{\Phi}$. How to prove the following identity?

$$\int d^{4}x\int d^{2}\theta d^{2}\bar{\theta}K(\Phi,\bar{\Phi})=\frac{1}{16}\int d^{4}x D^{2}\bar{D}^{2}K(\Phi,\bar{\Phi})|_{\theta=\bar{\theta}=0},$$

where $D_{\alpha}=\partial_{\alpha}-i(\sigma^{\mu})_{\alpha\dot{\beta}}\bar{\theta}^{\dot{\beta}}\partial_{\mu}$, and $\bar{D}_{\dot{\alpha}}=\bar{\partial}_{\dot{\alpha}}-i(\bar{\sigma}^{\mu})_{\dot{\alpha}\beta}\theta^{\beta}\partial_{\mu}$ are the supercovariant derivatives.

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