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If "sin"^(-1)x + "sin"^(-1)y +"sin"^(-1)...

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^2)`

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