Question: For any integer k, let ak = cos (k pi/7)+i sin(k pi/7), where i= -1. The value of the expression is.

For any integer k, let ak = cos (k pi/7)+i sin(k pi/7),

For any integer k, let ak = cos (k pi/7)+i sin(k pi/7), where i= -1. The value of the expression is.

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