- #1

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## Homework Statement

## \int {sin} \frac{\pi x} {L} dx ##

## Homework Equations

u substitution

## The Attempt at a Solution

If i make ## u = \frac{\pi x} {L} ## and then derive u I get ## \frac {\pi}{L} ## yet the final solution has ## \frac {L}{\pi} ##

The final solution is ## \frac {L}{\pi} - cos \frac {\pi x} {L} + C ##

What I am struggling to understand is why it becomes ## \frac {L}{\pi} ## instead of ## \frac {\pi}{L} ## ?

I would very much appreciate some assistance regarding this.

Thank you

Lazy