If a, b, c are the sides of the triangle...

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-

`45^(@)or135^(@)`

`30^(@)or100^(@)`

`50^(@)or100^(@)`

`60^(@)or120^(@)`

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