Find a unit vector parallel to the sum of the vector a =2i+4j-5k and b= i+2j+3k?
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The sum of the two vectors is 3i+6j−2k and the magnitude of this vector is √3²+6²+2²
=√49
= 7
Therefore, the unit vector is 3/7i+6/7j−2/7k.
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