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## Homework Statement

is the author wrong ? i was told that the f(x) = 0.5(a_0) +Σ(a_n)cos (n

**πx / L ) ........ but , in the example(photo2) , the author ignore the L , which the author gave f(x) = 0.5(a_0) +Σ(a_n)cos (n**

**πx ) +......**## Homework Equations

## The Attempt at a Solution

P/ s : i have tried to make some correction beside the working , is it correct ?[/B]

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