Equation Icon  3 2 2 a2 = - 2c1 +-4c3(c2-+-c3) +-c1(3c2-+-5c3 +-3c4) +-c1[(6c3--c4)(c3 +-c4)-+-c2(6c3 +-c4)]. (113) 2c1(c1 + c2 + c3)