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The angle between veca and vecb ,is 30^0...

The angle between `veca` and `vecb` ,is `30^0` and the angle between `vecb and vecc is ,60^0` the angle being measured in each case from the first vectro to the second vector nd in counter clockwise dirction. Compute `|veca+2vecb-3vecc|, ` given that `veca,vecb,vecc` are three coplanar unit vectors.

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