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If cot A/2:cot"" B/2: cot"" C/2 = 3:5:7 ...

If `cot A/2:cot"" B/2: cot"" C/2 = 3:5:7` then show that `a:b:c = 6:5:4`.

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The correct Answer is:
`6:5:4`
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