Equation Icon  1- 4au2/c2 A = ------2-------2--2-----2--4--4; (243) 1 + (a - 3a)u /c - 4a u /c B = --------------1---------------; (244) 1 + (a2 - 3a)u2/c2 - 4a2u4/c4 1 - (4/a + 4u2/c2) C = ------------------------------. (245) 1 + (a2 - 3a)u2/c2 - 4a2u4/c4