Докажите тождество алгебра 7 класс,

Пожалуйста пишите по подробней

даю 20 балов

а) (x-1)^3-4(x-1)=(x-1)(x+1)(x-3)

б) (x^2+1)^2-4x^2=(x-1)^2 (x+1)^2

в) (x+1)^3-(x+1)=x(x+1)(x+2)

г) 4b^2c^2-(b^2+c^2+a^2)^2=(a+b+c)(a-b-c)(a+b-c)(b+c-a)
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