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Given | vec a|=| vec b|=1a n d| vec a+ v...

Given `| vec a|=| vec b|=1a n d| vec a+ vec b|=sqrt(3).` If ` vec c` is a vector such that ` vec c- vec a-2 vec b=3( vec axx vec b),` then find the value of ` vec c. vec b`

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