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Changes
→Integrals and Sums
\framed[frame=off]{%
\dm{\sum_{k = 0}^{j + n} a_k = e^{a + b - c}} \par
\m{\sum_{k = 0}^{j + n} a_k = e^{a + b - c}}} \par
\dm{\int_a^b f(x) \dd x } \par
\m{\int_a^b f(x) \dd x } \par}