(1) The square of X - some square - x + 1 / 4 (2) The fourth power of X is the square of - 2x and the square of Y + 1 (3) Square of (x + y) - 4 (x + Y-1) (4) The square of 4x - the square of 6xy + 9y (5) The square of X + the square of 2XY + - y

(1) The square of X - some square - x + 1 / 4 (2) The fourth power of X is the square of - 2x and the square of Y + 1 (3) Square of (x + y) - 4 (x + Y-1) (4) The square of 4x - the square of 6xy + 9y (5) The square of X + the square of 2XY + - y

Is that y?
1,(x-y-1/2)(x+y-1/2)
2,(x^2Y^2-1)^2
3,(x+y-2)^2
4,(2x-3y)^2
5,(x+y)^2