5. Evaluate 
sin(x+2y) cos(x-2y) dA over the region R = {(x, y) | x ≥ 0, y ≥ 0, x + 2y ≤ 2π}. (15%)
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5. Evaluate sin(x+2y) cos(x-2y) dA over the region R = {(x, y) | x ≥ 0, y ≥ 0, x + 2y ≤ 2π}. (15%)