1) (6x+1)^2 + (6x-1)^2 -2(6x+1)(6x-1)
2) (5y-3)(5y+3) - (5y-4)^2
3) (2x+1)^2 + 2(4x^2-1) + (2x-1)^2
4) (6x+1)^2 - 2(6x+1)(6x-1) + (6x-1)^2
5) (x-3)(x+3) - (x-3)^2
6) (x-1)^2(x+2) - (x-2)(x^2+2x+4)
7) 4x(x-3) - 3x(2+x)
8) 2x(5x+2) + (2x-3)(3x-1)
9) (x-1)^2 - (x+2)(x-2)
10) 5y(2y-1) - (3y+2)(3-3y)
11) (2x+3) - 2(2x +3)(x-2) + (x-2)^2
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