R”의 두 벡터 a b 에 대하여 다음 등식이 성립함을 보여라. (a) a·b = - ||a + b||2 4 -||a - b||2 4 (b)(a+b)·(a-b) = ||a|| - ||b||2 -

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answerhappygod
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R”의 두 벡터 a b 에 대하여 다음 등식이 성립함을 보여라. (a) a·b = - ||a + b||2 4 -||a - b||2 4 (b)(a+b)·(a-b) = ||a|| - ||b||2 -

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how do you show these statement qualifies?
R”의 두 벡터 a b 에 대하여 다음 등식이 성립함을 보여라. (a) a·b = - ||a + b||2 4 -||a - b||2 4 (b)(a+b)·(a-b) = ||a|| - ||b||2 -
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