8. (10 Points) Evaluate the double integral
8. (10 Points) Evaluate the double integral , sin(x+y)dA where D is the regsion bounded by x+y= π, x+y = 0 and x -y =π and x-y=0.
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, sin(x+y)dA where D is the regsion
bounded by x+y= π, x+y = 0 and x -y =π and x-y=0.