For comparison with other CAS choose from: Axiom Derive Maple Mathematica Reduce
cn: (2+3*%i)*(15-6*%i)+2/(2-4*%i);
2 (15 - 6 %i) (3 %i + 2) + -------- 2 - 4 %i
cn: rectform(cn);
167 %i 241 ------ + --- 5 5