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In a triangle Delta ABC, prove the foll...

In a triangle `Delta ABC`, prove the following :
`(tan A//2)/((a-b)(a-c))+(tan B//2)/((b-c)(b-a))+(tan C//2)/((c-a)(c-b)) = (1)/(Delta)`

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VMC MODULES ENGLISH-PROPERTIES OF TRIANGLE-Level - 2
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