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[" 5.If "cos^(-1)x+cos^(-1)y+cos^(-1)z=p...

[" 5.If "cos^(-1)x+cos^(-1)y+cos^(-1)z=pi" ,prove that "x^(2)+y^(2)+z^(2)+2xyz=1],[" [Hint: Let "cos^(-1)x=A,cos^(-1)y=B,cos^(-1)z=C" then "A+B+C=pi" or "A+B],[=pi-c" take "cos" on both the sides]."]

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