A,- (x - y)² - (2x + y)²
B, (x + 2y)² + (x - 2y)²
C,(3x - 2)² - (3x - 1)²
D,(-2x + 3)² - (5x -3)²
E,- (-2x + 3)² - (5x - 3)²
F,-(2x+7)^2 +(2x-3)^2
G,-(2x-y)^2+(2x-3)^2
I,(x+2)^2-(x-3)(x+1)
H,(x+1)^2+(x-2)(x+2)-4x
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