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If |overset rarr a|=3,|overset rarr b|=...

If `|overset rarr a|=3,|overset rarr b|=4,|overset rarr c|=5 ` and every vector `overset rarr alpha` is perpendicular to the
sum of the other two vectors. Then the value of `|overset rarr a+overset rarr b+ overset rarr c|^(2)` is :

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