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problem with"Re" syntax


c[i_][t] = a[i][t] + I*b[i][t];
d[i_][t] = g[i][t] + I*h[i][t];
del = Together[Sum[Sqrt[i]*d[i - 1][t]*d[i][t], {i, 0, 5}]]
Re[del]

the problem is that after executing the program, as output I am not
able to get only the real part of the expression(del).the output
contains the whole expression though i am using "Re" term.

some valuable insight will be much appreciated.
regards,
tarun


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