Доведіть тотожність:
І варіант
а) (а – b)² + 2аb = а² + b²;
б) (а + b)² + (а – b)² = 2(а² + b²);
в) (а² + b²)(a^4 – а²b² + b^4) – (а³ – b³)(а³ + b³) = 2b^6.
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