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If a, b, c are the sides of the triangle ABC such that `a^(4) +b^(4) +c^(4)=2x^(2) (a^(2)+b^(2)),` then the angle opposite to the side c is-

A

`45^(@) or 135^(@)`

B

`30^(@) or 120^(@)`

C

`60^(@) or 150^(@)`

D

none of these

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