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Problem
Problem
In triangle, ABC, if
2
a
2
b
2
+
2
b
2
c
2
=
a
4
+
b
4
+
c
4
2a^2b^2 + 2b^2c^2 = a^4 + b^4 + c^4
2
a
2
b
2
+
2
b
2
c
2
=
a
4
+
b
4
+
c
4
, then angle B is equal to a.
45
∘
45^\circ
4
5
∘
b.
135
∘
135^\circ
13
5
∘
c.
120
∘
120^\circ
12
0
∘
d.
60
∘
60^\circ
6
0
∘
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