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Let vec a,vec b,vec c are three vectors ...

Let `vec a`,`vec b`,`vec c` are three vectors , such that `vec a`+`vec b`+`vec c`=`vec 0` .If ,`|vec a|=3`,`|vec b|=4` and
|`vec c|=5` , then the value of,`|vec a+vec b|^(2)`+`|vec b-vec c|^(2)`+`|vec c+vec a|^(2)`, equal to :

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