If sin^(-1) x = sin^(-1) y + sin^(-1) z ...

If `sin^(-1) x = sin^(-1) y + sin^(-1) z = pi " , prove that " x^(4) + y^(4) + z^(4) + 4x^(2) y^(2) z^(2) = 2 ( x^(2) y^(2) + y^(2) z^(2) + z^(2) x^(2))`

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