If A = 3i +2j and B = i -2j+3k, find the magnitudes of A + B and A - B?
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Answer:
A+B=(3i+2j+0k)+(i-2j+3k)
= 4i+3k
A-B=(3i+2j+0k)-(i-2j+3k)
= 2i+4j-3k
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