1. The vectors A = i +4k+3k and B=4i + 2j- 4k are
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Explanation:
A = i+ 4j +3k B = 4i +2j - 4k
the angle b/w the vectors are =
a.b = /A/ /B/ cosθ
(i+4j +3k)(4i +2j -4k) =√(1² +4² +3 ²) √(4²+ 2²+ (-4)²) cosθ
4 +8 -12 = √26 x √36 cosθ
0 = √26 x 6 cosθ
therefore cosθ =0
therefore the two vectors are perpendicular
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