упростите выражение:

1)(2a-b)(2a+b)+b^

2)9x^-(c+3x)(c-3x)

3)(a-c)(a+c)-(a-2c)^

4)(a+3c)^+(b+3c)(b-3c)

5)(x-3)(x+3)-(x+8)(x-8)

6)(x+7)^-10x

7)5b^-(a-2b)^

8)(x+3)^+(x-3)^

9)(x-4y)^+(x-4y)^

10)(2a+1)(2a-1)+(a-7)(a+7)

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