In a triangle \[ABC\] if \[2{{a}^{2}}{{b}^{2}}+2{{b}^{2}}{{c}^{2}}=\] \[{{a}^{4}}+{{b}^{4}}+{{c}^{4}}\], then angle B is equal to

\[{{135}^{o}}\]or \[{{120}^{o}}\]

\[{{45}^{o}}\]or \[{{135}^{o}}\]

\[{{30}^{o}}\]or \[{{60}^{o}}\]

In a triangle \[ABC\] if \[2{{a}^{2}}{{b}^{2}}+2{{b}^{2}}{{c}^{2}}=\]

1.	In a triangle \[ABC\] if \[2{{a}^{2}}{{b}^{2}}+2{{b}^{2}}{{c}^{2}}=\] \[{{a}^{4}}+{{b}^{4}}+{{c}^{4}}\], then angle B is equal to
A.	\[{{45}^{o}}\]or \[{{135}^{o}}\]
B.	\[{{135}^{o}}\]or \[{{120}^{o}}\]
C.	\[{{30}^{o}}\]or \[{{60}^{o}}\]
D.	None of these
Answer» B. \[{{135}^{o}}\]or \[{{120}^{o}}\]

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In a triangle \[ABC\] if \[2{{a}^{2}}{{b}^{2}}+2{{b}^{2}}{{c}^{2}}=\] \[{{a}^{4}}+{{b}^{4}}+{{c}^{4}}\], then angle B is equal to

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