CONSO, et al; if you are looking for a number, then reconsider the two charts “40% shift in SIN value” and “a mix of positive offset SIN and negative offset to COS” in
https://www.satcom.guru/2018/12/angl...ure-modes.html
”…about a 20 degree shifted output greater than normal… offsets to SIN and COS can cause shifts in the resolver output. These shifts either maintain nearly a constant value across the angular range ….”