Let ABC be a triangle of area 152 and the vectors AB→=i^+2j^-7k^,BC→=ai^+bj^+ck^ ....

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Let ABC be a triangle of area 152 and the vectors AB→=i^+2j^-7k^,BC→=ai^+bj^+ck^ and AC→=6i^+dj^-2k^,d>0. Then the square of the length of the largest side of the triangle ABC is ______ .
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