Questions
Suppose that are direction cosines of a line "" If the direction angles of the line are replaced by their supplements, the new direction cosines are
a
l,m,−n
b
l,−m,−n
c
−l,−m,−n
d
l,m,n
detailed solution
Correct option is C
If α,β,γare the angles made by a line ‘L’ with the coordinate axes in the positive direction then direction cosines arel,m,n=cosα,cosβ,cosγIf the direction angles are replaced by their supplements, then the direction cosines are cosπ−α,cosπ−β,cosπ−γ=−cosα,−cosβ,−cosγ=−l,−m,−nTalk to our academic expert!
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The dc’s of the line passing through P and the origin are
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