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

If `Sin^(-1)x + Sin^(-1)y + Sin^(-1)z = pi`, then 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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