Упростите выражения:

1) (3a-2b)^2 - (2a+3b)^2
2) (0,8+5)^2 + (0,4-2)^2
3) (1/2x+3y)^2 - (1/3x-2y)^2
4) (1/3x-2y)^2 + (2x+1/4y)^2
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