Given sin(A)+sin(B)=1\sin(A) + \sin(B) = 1sin(A)+sin(B)=1 and cos(A)+cos(B)=3\cos(A) + \cos(B) = \sqrt{3}cos(A)+cos(B)=3, what is the value of cos(A−B)\cos(A-B)cos(A−B)?
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1/41/41/4
1/21/21/2
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