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[86.cos^(-1)a+cos^(-1)b+cos^(-1)c=pi," d...

[86.cos^(-1)a+cos^(-1)b+cos^(-1)c=pi," dil "],[a^(2)+b^(2)+c^(2)+2abc=.........],[" (a) "0]

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If cos^(-1)a+cos^(-1)b+cos^(-1)c=pi then prove that a^(2)+b^(2)+c^(2)+2abc=1

Prove the followings : If cos^(-1)a+cos^(-1)b+cos^(-1)c=pi then a^(2)+b^(2)+c^(2)+2abc=1 .

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(cos A)/(a)+(cos B)/(b)+(cos C)/(c)=(a^(2)+b^(2)+c^(2))/(2abc)

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