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Mathematics
Mathematics
Problem
Find the direction cosines of a vector
r
\mathbf{r}
r
which is equally inclined to
O
X
OX
O
X
,
O
Y
OY
O
Y
and
O
Z
OZ
O
Z
. If
∣
r
∣
|\mathbf{r}|
∣
r
∣
is given, find the total number of such vectors.
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