3. Evaluate the line integral I = F dr where C' is the triangle from (0,0)...

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3. Evaluate the line integral I = F dr where C' is the triangle from (0,0) to (0, 4) to (2,0) to (0,0) and F = (y cos x - xy sin x, xy + x cos x). Answer: -16/3 -- 3. Evaluate the line integral I = F dr where C' is the triangle from (0,0) to (0, 4) to (2,0) to (0,0) and F = (y cos x - xy sin x, xy + x cos x). Answer: -16/3 --