find angle between two vectors a= 2i + j - k and b= i - k
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Step-by-step explanation:
Angle between vectors A and B is cos(theta) A.B/|A||B|
A•B=2×1+(-1×-1)=2+1=3
|A|=√6,|B|=√2
Cos(theta)=3/√2√6=3/√12=3/2√3=√3/2
cos(theta)=√3/2=cos30°
Therefore angle between the vectors is 30°
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