If A=4i+4j+4k and b=3i+j+4k, then angle between vectors A and B is
Options
(a) 180゚
(b) 90゚
(c) 45゚
(d) 0゚
Correct Answer:
90゚
Explanation:
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a.b=|a||b|cos(x)
(4,4,-4) (3,1,4) = 4x3+4x1+(-4)x4
= 12+4-16
=0