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AP EAMCET Engineering 22 Apr 2019 Shift 1 Paper

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Question : 60

Total: 160

If l1,m1,n1 and l2,m2,n2 are direction cosines of

such that ∠ AOB = θ , where O is the origin, then the direction cosines of the internal angular bisector of ∠ AOB are

l1+l2
2sin
θ
2
,
m1+m2
2sin
θ
2
,
n1+n2
2sin
θ
2
l1−l2
2cos
θ
2
,
m1−m2
2cos
θ
2
,
n1−n2
2cos
θ
2
l1−l2
2sin
θ
2
,
m1−m2
2sin
θ
2
,
n1−n2
2sin
θ
2
l1+l2
2cos
θ
2
,
m1+m2
2cos
θ
2
,
n1+n2
2cos
θ
2

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