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cos-A-cos-B-cos-C-1-r-R-




Question Number 21267 by oyshi last updated on 18/Sep/17
cos A+cos B+cos C=1+(r/R)
$$\mathrm{cos}\:{A}+\mathrm{cos}\:{B}+\mathrm{cos}\:{C}=\mathrm{1}+\frac{{r}}{{R}} \\ $$

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