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(i) If in a triangle ABC, a^(4) + b^(4) ...

(i) If in a triangle ABC, `a^(4) + b^(4) +c^(4) - 2b^(2) c^(2) -2c^(2)a^(2)=0`, then show that, `C=45^(@)` or `135^(@)`.
(ii) In in a triangle ABC,
`sin^(4)A + sin^(4)B + sin^(4)C = sin^(2)B sin^(2)C + 2sin^(2) C sin^(2)A + 2sin^(2)A sin^(2)B`, show that, one of the angles of the triangle is `30^(@)` or `150^(@)`

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