Equation Icon  √ ----∘ ----- F = ℏkp(AT A + BT B − AT A − BT B ) = 2R-(ℐ − ℐ ) − 4--RT-- ℐ ℐ cosΦ , (256 ) 0 2 1 1 1 1 2 2 2 2 c 1 2 c 1 2 0