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" Q.11) If "cos^(-1)x+cos^(-1)y+cos^(-1)...

" Q.11) If "cos^(-1)x+cos^(-1)y+cos^(-1)z=x," prove that "x^(2)+y^(2)+z^(2)+2xyz=1

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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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