SIMPLIFY [x+1][y+1]+[x-1][x+1]?

or:SIMPLIFY [x+1][y+1]+[x-1][x+1]?or:a:= (x+1) (y+1) = xy + x + y + 1b:= (x+1) (x-1) = x\u00b2 -1a + b = x\u00b2 + xy + x + y

or:SIMPLIFY [x+1][y+1]+[x-1][x+1]?

or:a:= (x+1) (y+1) = xy + x + y + 1b:= (x+1) (x-1) = x\u00b2 -1a + b = x\u00b2 + xy + x + y

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