find a unit vector in the direction of a-b, where a= i+2j-3k and b=2i-j+2k.
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Step-by-step explanation:
a =i+2j-3k
b=2i-j+2k
a-b=i+2j-3k -(2i-j+2k)
=i-2i+2j+j-3k-2k
=-3i+3j-5k
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