Объяснение:
2в^2+а^2-в^2=а^2+2ав+в^2-2ав
в^2+а^2=а^2+в^2
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Объяснение:
2в^2+а^2-в^2=а^2+2ав+в^2-2ав
в^2+а^2=а^2+в^2