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Mathematics
Mathematics
Problem
11. Show that the direction cosines of a vector equally inclined to the axes
O
X
,
O
Y
\mathrm{OX}, \mathrm{OY}
OX
,
OY
and
O
Z
O Z
O
Z
are
±
(
1
3
,
1
3
,
1
3
)
\pm\left(\frac{1}{\sqrt{3}}, \frac{1}{\sqrt{3}}, \frac{1}{\sqrt{3}}\right)
±
(
3
1
,
3
1
,
3
1
)
.
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