Срочно!Помогите с алгеброй!!! Упростите выражения:
1)(а-2)^2-(а-1)(а+3)
2)(b+4)(b-2) - (b-1)^2

PS- знак ^2 обозначает КВАДРАТ, Т.Е. .....(а-2) В КВАДРАТЕ
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