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Date: 2001-11-06 09:11 am (UTC)b^2 = a^2 + c^2 - 2ac*cos(phi) => cos(phi) = ???? ?? ?? ??? ?????, ?????????
m^2 = a^2 + (c/2)^2 - 2a(c/2)*cos(phi) - cos(phi) ????????????? ?? ?????????? ???????. ?????. ????? ???.