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IF bara,barb,barc are three vectors such...

IF `bara,barb,barc` are three vectors such that each is inclined at an angle `pi/3` with the other two and `|bara|=1,|barb|=2,|barc|=3` then the scalar product of the vectors `2bara+3barb-5barc and 4bara-6barb+10barc` is equal to

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