Do you get 1 or 2 rogue talents/advanced talents at level 10 of the unchained rogue?
If 2, can you use both for advanced talents?
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Unchained Rogue's Advanced Talents says this:
At 10th level and every 2 levels thereafter, a rogue can choose [an] advanced talent in place of a rogue talent. (emphasis mine)
So this gives you the option of choosing from a separate set of talents, but does not grant any further talents.
So your gain in talents for your advancement to 10th level is one talent, advanced or regular.