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bar(a),b,bar(c) are three vectors such ...

`bar(a),b,bar(c)` are three vectors such that `|bar(a)|=1`,`|bar(b)|=2`,`|vec c|=3` and `bar(b).bar(c)=0` .If the projection of `bar(b)` along `bar(a)` is equal to the projection of `bar(c)` along `bar(a)` , then `|2bar(a)+3bar(b)-3bar(c)|=`

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