\begin{equation}\begin{split}
\scalebox{1.5} { $\prod^{e}= \frac{1}{2} \int_{x_a}^{x_b} A_e E_e u^{T} B^T B u dx $ + {\color{blue} { $U_{ts}= \frac{1}{2} C (\frac{dw^{element 1}}{du}\Big|_{u=0})$ }} + {\color{blue}$U_s = \frac{1}{2} C (P_0)$ } -$ \int_{x_a}^{x_b} u^{T} B^T q_0 dx$} \\
\end{split}
\end{document}