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3D Geometry question

2018 · 15 Apr · Shift 2 · Q33

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JEE Main
Mathematics
3D Geometry
2018 · 15 Apr · Shift 2 · Q33

3D Geometry question

2018 · 15 Apr · Shift 2 · Q33

JEE MainMathematics3D GeometryMCQ+4 / −1

An angle between the lines whose direction cosines are gien by the equations,

l

+ 3m + 5n = 0 and 5

l

m

-

2mn + 6n

l

= 0, is :

A
${\cos ^{ - 1}}\left( {{1 \over 3}} \right)$
B
${\cos ^{ - 1}}\left( {{1 \over 4}} \right)$
C
${\cos ^{ - 1}}\left( {{1 \over 6}} \right)$
D
${\cos ^{ - 1}}\left( {{1 \over 8}} \right)$

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