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tan^(2)'(pi)/(16)+tan^(2)'(2pi)/(16)+tan...

`tan^(2)'(pi)/(16)+tan^(2)'(2pi)/(16)+tan^(2)'(3pi)/(16)+tan^(2)'(5pi)/(16)+tan^(2)'(6pi)/(16)+tan^(2)'(7x)/(16)` is equal to

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