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Is the answer, Fourier Series
chatime1
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![I didn’t want to use the WiFi anyway [pic]](https://i0.wp.com/faildesk.net/wp-content/uploads/2014/01/wifi_challenge.jpg?fit=500%2C500&ssl=1 "I didn’t want to use the WiFi anyway [pic]")
Is the answer, Fourier Series
chatime1