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(
r
⋅
i
^
)
2
+
(
r
⋅
j
^
)
2
+
(
r
⋅
k
^
)
2
(\mathbf{r} \cdot \hat{i})^2 + (\mathbf{r} \cdot \hat{j})^2 + (\mathbf{r} \cdot \hat{k})^2
(
r
⋅
i
^
)
2
+
(
r
⋅
j
^
)
2
+
(
r
⋅
k
^
)
2
…
Mathematics
Problem
(
r
⋅
i
^
)
2
+
(
r
⋅
j
^
)
2
+
(
r
⋅
k
^
)
2
(\mathbf{r} \cdot \hat{i})^2 + (\mathbf{r} \cdot \hat{j})^2 + (\mathbf{r} \cdot \hat{k})^2
(
r
⋅
i
^
)
2
+
(
r
⋅
j
^
)
2
+
(
r
⋅
k
^
)
2
is equal to a.
3
r
2
3r^2
3
r
2
b.
r
2
r^2
r
2
c. 0 d. None of these
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