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" 13."[" सदि "cos^(-1)x+cos^(-1)y+cos^(-...

" 13."[" सदि "cos^(-1)x+cos^(-1)y+cos^(-1)z=pi" हो तो सिब्ध "],[" कीजिए कि "x^(2)+y^(2)+z^(2)+2xyz=1]

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