Calculate the line integral of the vector field F = xy i + (x − y) j along C, the triangle composed of three segments. C1 is the line segment from (4, 0) to (-4, 0). C2 is the line segment from (-4, 0) to (0, 4). C3 is the line segment from (0, 4) to (4, 0).
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or segment from (4,0) to (-4,0), y is always zero because straight segment. in that case x*y=x*0=0 and x+y=x+0=x if you choose x=4-t where t goes from 0 to 8 you should get r(t)=0i+(4-t)j
