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Mathematics
Mathematics
Problem
The angle between the pair of planes represented by equation
2
x
2
−
2
y
2
+
4
z
2
+
6
x
z
+
2
y
z
+
3
x
y
=
0
2x^2 - 2y^2 + 4z^2 + 6xz + 2yz + 3xy = 0
2
x
2
−
2
y
2
+
4
z
2
+
6
x
z
+
2
y
z
+
3
x
y
=
0
is a.
cos
−
1
(
1
3
)
\cos^{-1}\left(\frac{1}{3}\right)
cos
−
1
(
3
1
)
b.
cos
−
1
(
4
21
)
\cos^{-1}\left(\frac{4}{21}\right)
cos
−
1
(
21
4
)
c.
cos
−
1
(
4
9
)
\cos^{-1}\left(\frac{4}{9}\right)
cos
−
1
(
9
4
)
d.
cos
−
1
(
7
84
)
\cos^{-1}\left(\frac{7}{\sqrt{84}}\right)
cos
−
1
(
84
7
)
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