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**mmattson07** Find the average value fave of the function f on the given interval.

$\displaystyle f(x)=7\sin(10x) , [-\pi, \pi]$

My integral should look like this?

$\displaystyle \frac{1}{\pi-(-\pi)}\int_{-\pi}^\pi \! 7\sin(10x) \, dx $

The bottom bound is supposed to be neg pi

so then we have

$\displaystyle -\frac{7}{20\pi}(\cos(10x))\bigg|_{-\pi}^\pi$

Again...lower bound is neg pi anyone know how i format that when i put a - sign next to the\pi it screws it up. Anyway, am i on the right track here?