Докажите тождество :
а) a^2 - b^2 - (a+b)^2 = -2b(a+b)
б) (a-b)^2 - (a^2 - b^2) = -2b(a-b)
а) a^2 - b^2 - (a+b)^2 = -2b(a+b)
б) (a-b)^2 - (a^2 - b^2) = -2b(a-b)
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