CBSE Class 12-science Answered
You can answer this question in the following way:
Let the angle between the vectors be Φ
Thus we have the following relation:
|a+b|2 = |a|2 + |b|2 +2|a||b|cosΦ
As a and b and a+b are unit vectors |a|, |b|, |a+b| are 1
Thus solving we get: cosΦ = -0.5
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