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If sin^-1 x+sin^-1 y+sin^-1 z= pi prove ...

If `sin^-1 x+sin^-1 y+sin^-1 z= pi prove that: x^4+y^4+z^4+4x^2y^2z^2=2(x^2y^2+y^2z^2+z^2x^20`

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