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Question

The angle between the two lines whose direction cosines are (34,14,32) and (34,14,32)

A
π
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B
π2
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C
2π3
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D
π4
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Solution

The correct option is D 2π3
Angle between two lines is
Cosθ=l1l2+m1m2+n1n2
cosθ=3434+1414+34(34)
316+11634
=1434
cosθ=12
θ=2π3

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