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car H est le projeté orthogonal de O sur (HB) et AÎ(HB) |
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car (OA) ^ (BK) |
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car (OB) ^ (JA) |
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car H est le projeté orthogonal de O sur (AH) et BÎ(AH) |
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car |
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car |
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car (OA) ^ (JH) |
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car (OB) ^ (HK) |
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car |
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car |
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car |
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(OI) ^ (JK) car produit scalaire nul |
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