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Mathematics
Mathematics
Problem
The angle between the planes
r
⃗
⋅
(
3
i
^
−
4
j
^
+
5
k
^
)
=
0
\vec{r} \cdot (3\hat{i} - 4\hat{j} + 5\hat{k}) = 0
r
⋅
(
3
i
^
−
4
j
^
+
5
k
^
)
=
0
and
r
⃗
⋅
(
2
i
^
−
j
^
−
2
k
^
)
=
0
\vec{r} \cdot (2\hat{i} - \hat{j} - 2\hat{k}) = 0
r
⋅
(
2
i
^
−
j
^
−
2
k
^
)
=
0
is (A)
π
3
\frac{\pi}{3}
3
π
(B)
π
2
\frac{\pi}{2}
2
π
(C)
π
6
\frac{\pi}{6}
6
π
(D)
π
4
\frac{\pi}{4}
4
π
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