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Mathematics
Mathematics
Problem
Find the values of 'a' for which the vector
r
⃗
=
(
a
2
−
4
)
i
^
+
2
j
^
−
(
a
2
−
9
)
k
^
\vec{r} = (a^2 - 4)\hat{i} + 2\hat{j} - (a^2 - 9)\hat{k}
r
=
(
a
2
−
4
)
i
^
+
2
j
^
−
(
a
2
−
9
)
k
^
makes acute angles with the coordinate axes.
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