If sin(x)+sin(y)=1\sin(x) + \sin(y) = 1sin(x)+sin(y)=1 and cos(x)+cos(y)=3\cos(x) + \cos(y) = \sqrt{3}cos(x)+cos(y)=3, find cos(x−y)\cos(x-y)cos(x−y).
0.50.50.5
111
000
−0.5-0.5−0.5