Докажите тождество пж даю 10 баллов
(-a-b)²=(a+b)
(-a-b)(a+b)=-(a+b)²
(a+b-c)=a²+b²+c²+2ab-2ac-2bc
(a-b-c)²=a²+b²+2ab-2ac-2bc
(a-b-c)²=a²+b²+c²-2ab-2ac+2bc решите пожалуйста даю 10 балов
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