Find the product of the following using the special product formulas if necessary. Show your solution.

1. 3(3x + 2y)
2. 4a(2a+a+3)
3. 2a(1-3a)
4. (2a+2b) (2c+2d)
5. (3a-4)(a+7)
6. (4x+2y)(x+y)
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