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\begin{align}
\mathcal{L} &\supset \frac{g^2}{4} \left[ h_1^2 + h_2^2 \right] W^+_{\mu} W^{- \mu}
+ \frac{(g^2 + g^{\prime 2})}{8} \left[ h_1^2 + h_2^2 \right] Z_{\mu} Z^{\mu} = {} \nonumber \\
{}&= \frac{g^2}{4} \left[ (h^0)^2 + (H^0)^2 \right] W^+_{\mu} W^{- \mu}
+ \frac{(g^2 + g^{\prime 2})}{8} \left[ (h^0)^2 + (H^0)^2 \right] Z_{\mu} Z^{\mu}.
\end{align}H