If tan A=1,and sinB=1/2, find the value of cos(A+B) where A and B are both acute angles.

If tan A=1,and sinB=1/2, find the value of cos(A+B) where A and B are

1.	If tan A=1,and sinB=1/2, find the value of cos(A+B) where A and B are both acute angles.
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