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CBSE XII
>>
Math
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Three Dimensional Geometry
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Q)
If a variable line in two adjacent positions has direction cosines l,m,n and
l
+
δ
l
,
m
+
δ
m
,
n
+
δ
n
,show that the small angle
δ
θ
between the two positions is given by
δ
θ
2
=
δ
l
2
+
δ
m
2
+
δ
n
2
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