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Question

The direction cosines of the lines bisecting the internal angle θ between the lines whose direction cosines are l1,m1,n1 and l2,m2,n2 are

A
<l1+l2,m1+m2,n1+n2>
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B
<l1+l22sinθ2,m1+m22sinθ2,n1+n22sinθ2>
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C
<l1+l22cosθ2,m1+m22cosθ2,n1+n22cosθ2>
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D
none of these
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