Use the Fourier series expansions of periodic square wave and triangular wave signals to find the sum

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Use the Fourier series expansions of periodic square wave and triangular wave signals to find the sum of the following series: 

(a) 1 - 1/3 + 1/5 - 1/7 + ....

(b) 1 + 1/9 + 1/25 + 1/49 + ....

Write down the Fourier series in each case and evaluate it for a particular, appropriately chosen value of t.

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