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[" 14.afg "cos^(-1)x+cos^(1)y+cos^(1)z=p...

[" 14.afg "cos^(-1)x+cos^(1)y+cos^(1)z=pi" ,at Rerea anflort "(1)/(100)x^(2)+y^(2)+z^(2)+2xyz=1],[" 15."(18)/(48)sin(sin^(2)(1)/(5)+cos^(2)x)=1,(1)/(37)xbar(pi)^(2)]

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If cos^(-1) x + cos^(-1) y + cos^(-1) z = pi , prove that x^(2) + y^(2) + z^(2) + 2xyz = 1

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