Упростите выражения : 

1) (1- 3c)² + 3(2c +1)

2) (7x + 4)² - 4x(5-2x)

3)(c - 4)² - (c - 10)(c + 10)

4) (1 - 2y)² - (2y - 3)(2y +3) 

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