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AP EAPCET 16th May 2023 Shift 2 Solved Paper

Section: Mathematics
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Question : 48 of 160
 
Marks: +1, -0
If (l1,m1,n1),(l2,m2,n2) are the direction cosines of two lines, then
(l1m2−l2m1)2+(m1n2−m2n1)2+(n1l2−n2l1)2+(l1l2+m1m2+n1n2)2=
Validate
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