यदि `"cos"^(-1)x+"cos"^(-1)y+"cos"^(-1)z=pi` तो सिद्ध कीजिए कि `x^(2)+y^(2)+z^(2)+2xyz=1`
यदि `"cos"^(-1)x+"cos"^(-1)y+"cos"^(-1)z=pi` तो सिद्ध कीजिए कि `x^(2)+y^(2)+z^(2)+2xyz=1`
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