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In a Delta ABC, a ^(4)+b^(4) + c^(4) = 2...

In a `Delta ABC, a ^(4)+b^(4) + c^(4) = 2b^(2)c^(2)+2a^(2)b^(2), " then B"=`

A

`(pi)/(4)or (3pi)/(4)`

B

`(pi)/(2)`

C

`(pi)/(3)or (2pi)/(3)`

D

`(pi)/(6) or (5pi)/(6)`

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A
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