Given a = 1 / 2x ^ 2y-1 / 3xy, B = 3xy + 2 / 3Y ^ 2. Find a + B and a-b

Given a = 1 / 2x ^ 2y-1 / 3xy, B = 3xy + 2 / 3Y ^ 2. Find a + B and a-b

A+B=(1/2x²y-1/3xy)+(3xy+2/3y²)=1/2x²y-1/3xy+3xy+2/3y²=1/2x²y+8/3xy+2/3y²A-B=(1/2x²y-1/3xy)-(3xy+2/3y²)=1/2x²y-1/3xy-3xy-2/3y²=1/2x²y-10/3xy-2/3y&...