If in DeltaABC,a^(4)+b^(4)+c^(4)=2a^(2)(...

If in `DeltaABC,a^(4)+b^(4)+c^(4)=2a^(2)(b^(2)+c^(2))`, then `angleA` is

A

(a) `30^(@)`

B

(b) `45^(@)`

C

(c) `60^(@)`

D

(d) `90^(@)`

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The correct Answer is:

B

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