You subtract 0%, assuming you have 26 expertise (=0% dodge), since the equation is looking for dodge chance.

At 0 exp, you'd subtract 6.5% because you have a 6.5% chance to dodge.

Having more expertise allows you to have a higher crit cap, not lower it.

If you are expertise capped, and you are stil above your crit cap, you have two options. Either lower your crit by choosing different gear or replacing some of your agility proc trinkets with other strong alternatives, or increase your hit rating thus reducing your chance to be missed and leaving more room for crits.

You should keep in mind that there is hard crit capping, when you are capped without trinket procs, i.e. the uptime of crit capping is 100%. In that situation adding more hit rating to remove crit capping problem will most likely be a dps increase. Then there is also a soft cap, when you go above crit cap only when certain trinkets proc. In that situation, removing the crit capping problem may or may not be optimal since the uptime of crit capping is less than 100%. While the proc is up, extra hit definitely helps, but while it's down, there may be other stats that have more value than hit, such as haste, AP and Arp. So if it's a soft crit cap, you should definitely consult the spreadsheet.

So reading you have said I can understand it... Using my currently stats to explain: Crit cap is 100% -24%glancing blows -9,76%=66,24 as result, but how with this result I can know if I'm above the crit cap? I add the 66,24% more my currently passive crit chance?
My big problem is to know how I can know when I'm above the cap, using which methods?

You compare your crit rate with all your buffs and all boss debuffs in a raid to 66.24%. Going above 66.24% is a waste of crit for autoattacks.

that is correct

I have a question about the EP values. Why is it that agility EP is still much higher than the AP one for mutilate builds? The spreadsheets are telling me that I should gem for AP over agility though. Have the EP values been updated correctly?

AP costs half as much item budget as agility, so there is twice as much of it on gear (and gems). The sheet will only suggest gemming agi if its EP is more than twice as much as AP.

remove

I think he got that, but was saying that someone new might not get it immediately.

I know it took me a couple of re-reads to figure out that was what it stood for when I first got here.

EP weights question: Let me preface this with, yes I know all EP weights are approximate and variable, and yes I use the spreadsheets, however I see a large gap I want to address; In Aldriana's posts and spreadsheets, she lists AP and Haste as the highest weighted stats for Mutilate, but the OP gives AP only a 1 weight and Agility a 1.94, despite the numbers being pulled from Aldriana's formula's. Is there a reason behind this discrepancy and which stat should, in fact, be the higher weighted one?

Just to follow up with one more clarification. The EP weight of AP is never variable or approximate. It's 1. The thing you are measuring is "how does stat X compare to attack power". (In the example, agility has of weight of 1.94 which means, "I will gain the equivalent of what 1.94 AP gives me if I add 1 agility.)

The follow up on item budgets and why 40 AP gems are better is of course correct, but AP will always have an "EP" of 1. The reason why it's a calculated value and changing with your gear should be clear, but if not, there are resources here to check into as well as the simple questions thread.