4. Докажите тождество: a) c3 + d3 + 3cd(c + d) = (c + d 3 = b) (a + b)²(a +b)+ 6ab (a – b) + 10ab(b – a) = (a - b)3 ПОМОГИТЕ ПОЖАЛУЙСТА ДАЮ 50 БАЛЛОВ​
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