Using trigonometric identities, show that the basis functions in the series in Eq. (11.1) are periodic with

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Using trigonometric identities, show that the basis functions in the series in Eq. (11.1) are periodic with period 2L.

ο (Η) +> bn sin ηπx (). f (x) a0 +aη cos . n=1 n=1 (11.1)

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