If a semi-circular contour D of radius 2 is as shown in the figure given below, the value of the integral $\int_D N \frac{1}{(S^2 -1)}ds$ is

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If a semi-circular contour D of radius 2 is as shown in the figure given below, the value of the integral $\int_D N \frac{1}{(S^2 -1)}ds$ is
