2.6.2.28 Trigonometric Fourier Series
Condition: function \ (f (x) = x^{2}-\ pi^{2} \) put in a row Fourier on the segment \ ([-\ pi; \ pi] \). Using the resulting decay, find the sum of the number of: \ [\ sum_ {n = 1}^{\ infty} \ frac {1} {n^{2} \ text {. } \]
Trigonometric Fourier Series - Calculation of Fourier CoEfficents, Expansion of Function in Cosines and Sines, Plotting Graphs of the Sum of the Fourier Sersing Using Using Using USIs. The Dirichlet Theorem, As Well as Graphs of Partial Sums.