- #1

- 12

- 0

## Main Question or Discussion Point

hi,

how can I calculate average of cos

I want to take average over a sphere

I tried to do like this: <cos

and I get 1/2

but in my books, wrote that average of cos

how can I calculate average of cos

^{2}x ?I want to take average over a sphere

I tried to do like this: <cos

^{2}X>= 1/2π ∫cos^{2}xdxand I get 1/2

but in my books, wrote that average of cos

^{2}x , taken over a sphere, is 1/3