Answer
$1$
Work Step by Step
Given: $\int_C (x-y) dx +(x+y) dy$
Now,
$\int_C (x-y) dx +(x+y) dy=\int_{0}^1 x dx+\int_{0}^1 (2x-2) dx+\int_{0}^1 y dy$
Thus, $(\dfrac{1}{2})+1-(\dfrac{1}{2})=1$
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