For comparison with other CAS choose from: Derive Macsyma Maple Mathematica Reduce
cn:= (2+3*%i)*(15-6*%i)+2/(2-4*%i)
63 + 115%i
----------
2 + %i
Type: Fraction Complex Integer
real(cn) + %i*imag(cn)
+---+
167\|- 1 + 241
---------------
5
Type: Expression Integer