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2 sqrt(21) sin(1/3 tan^(-1)(sqrt(3)/37)) - 2 sqrt(7) cos(1/3 tan^(-1)(sqrt(3)/37)) = 4sqrt(7)cos((1/3)arctag(sqrt3/37)-2pi/3)
2 sqrt(21) sin(1/3 tan^(-1)(sqrt(3)/37)) - 2 sqrt(7) cos(1/3 tan^(-1)(sqrt(3)/37)) = 4sqrt(7)cos((1/3)arctag(sqrt3/37)-2pi/3)
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