Question :If A=4i+9j+10k
B=2i-4j-2k
Find A. B?
Cos theta ?
Question :A= 4i-j+3k
B= -2i+j-2k
Find A. B?
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Answer:
i) A.B= (2i+9j+10k).(2i-4j-2k)
A.B= 4-36-20
= -52
ii)A.B=-8-1-6
=-15
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