I read my book of EDP, and there appears the next serie
∑k=11k2=π26
And, also, we prove that this series is equal π26 for methods od analysis of Fourier, but...
Do you know other proof, any more simple or beautiful?
How to find limh→0sin(ha)h without lhopital rule? I know when I use lhopital I easy get $$ \lim_{h\rightarrow 0}...
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