# [Tex/LaTex] Align square root symbols in equation

equationsmath-modespacing

I have the following equation in my tex document:

\documentclass{article}
\begin{document}
$$x_{ij} = \frac{ \sum_{t}{e_i(t)e_j(t)} } { \sqrt{\sum_t{e_i^2(t)}} \sqrt{\sum_t{e_j^2(t)}} }$$
\end{document}


The equation is printed like this:

The problem is that despite having almost the same content, the two square root symbols are rendered with a different size.

Is it possible to equalize the size of the two square root symbols?

\documentclass{article}
$$x_{ij} = \frac{ \sum_{t}{e_i(t)e_j(t)} } { \sqrt{\strut\sum_t{e_i^2(t)}} \sqrt{\strut\sum_t{e_j^2(t)}} }$$