If a and b bar are two vectors such tho |a|= 4, b=1/2 and a.b = -1. -
find the angle between a and b
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Answer:
120°
Explanation:
Cos angle = a.b / |a| |b|
= - 1 / [4 ÷ (1÷2)]
= - 1/ 2
Angle = cos ^ - 1 (-1/2) = 120°
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