https://www.chegg.com/homework-help/questions-and-answers/question-1-4-marks-find-fourier-series-periodic-function-shown-figure-1-o-t-tt-2-0-t-2-t-p-q24293960

https://www.chegg.com/homework-help/questions-and-answers/question-2-6-marks-periodic-square-wave-voltage-seen-figure-2-applied-circuit-shown-figure-q31736401