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[" (क) यदि "cos^(-1)a+cos^(-1)b+cos^(-1)...

[" (क) यदि "cos^(-1)a+cos^(-1)b+cos^(-1)c=pi," तो सिब्ध कीजिए कि : "],[qquad a^(2)+b^(2)+c^(2)+2abc=1]

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