Question 173421
Sigma sec(2^r theta)?
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Hmmm!  Was it something like this:

{{{sum(sec(2^r)phi, r=0, infinity )}}}

(I can't make a "theta", so I made a "phi" instead.)
Was there something below the "sigma" and something
above it?  Please repost telling us more about the problem. 
We can't answer it from just what you have given us.

Edwin</pre>