(* Created with the Wolfram Language for Students - Personal Use Only : www.wolfram.com *)
(-2*CA^2*(-2 + D)*(s34^2 - 2*sP3*sP4 - s34*(sP3 + sP4))*(-1 + z4)*z4)/
 (s34^2*sP3*sP4*(-1 + z34)^2)
