The reduction of the square B of 2A - [the square of 2ab-2 (the square B of a + the square of 2Ab)]

The reduction of the square B of 2A - [the square of 2ab-2 (the square B of a + the square of 2Ab)]

2a²b-[2ab₂-2(a²b+2ab²)]=2a²b-[2ab²-2a²b-4ab²]=2a²b-(-2a²b-2ab²)=2a²b+2a²b+2ab²=4a²b+2ab²