2ab+3cd-4ab-3cd
2xy-4ac+5yx+4ac
\left(32,\:09112H+4,\:01139\right)^2=106,\:066H^5
2 + 2 +2 + 2, ... , + 3 sigma notation
3cd-4cd+cd
2 + 2 +2 + 2 + 3 sigma notation
2ac+3ac-4ac
5x-3y+2x-4y
x^2y+xy+x^2y
x^2+x^2+3x^2
