The wikipedia article gives a formula for calculating the order of an orthogonal group over finite filed $O(n,q)$:

I don't see how I can get such formula. Can one come up with some references?
The wikipedia article gives a formula for calculating the order of an orthogonal group over finite filed $O(n,q)$:

I don't see how I can get such formula. Can one come up with some references?
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