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[" If in "Delta ABC,A=(pi)/(7),B=(2 pi)/...

[" If in "Delta ABC,A=(pi)/(7),B=(2 pi)/(7),C=(4 pi)/(7)" then "a^(2)+b^(2)+c^(2)],[[" (1) "R^(2)," (2) "3R^(2)," (3) "4R^(2)," (4) "7R^(2)]]

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