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Question

If a,b,c are non-coplanar unit vectors such that a×(b×c)=b+c2, then the angle between a and b is

A
3π4
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B
π4
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C
π2
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D
π
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Solution

The correct option is D 3π4
a×(b×c)
=b(a.c)ca.b)
=b2+c2
Comparing coefficients, we get
a.c=12 and a.b=12
If θ is the angle between a and b, then cosθ=12
Hence angle between a and b is 3π4

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