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Prove that (r(2) + r(3))/(1 + cos A)...

Prove that
`(r_(2) + r_(3))/(1 + cos A) = (r_(3) + r_(1))/(1 + cos B) = (r_(1) + r_(2))/(1+ cos C)`

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VMC MODULES ENGLISH-PROPERTIES OF TRIANGLE-Level - 2
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