Sneak attacks with daggers now do a total of fifteen times normal damage.
Dual wielding power attacks do 50% bonus damage.
My question is, assuming I have both perks, am wielding two identical weapons and my weapon damage is X, will I do 2X * 15 * 1.5 = 45X damage or 2X * 15 + (2X * 1.5) = 33X damage?
If anyone is able to back up an answer with examples from in-game, that would be great.
Note: Don't consider the Armsman perk, the damage multiplier from one-handed skill and the damage multiplier for power attack vs regular attacks. I left them out deliberately for clarity, as I already know they stack.