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[" 31.यदि "cos^(-1)x+cos^(-1)y+cos^(-1)z...

[" 31.यदि "cos^(-1)x+cos^(-1)y+cos^(-1)z=pi," सिद्ध करें कि "x^(2)+y^(2)+z^(2)+2xyz=1],[" 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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