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त्रिभुज ABC में यदि / C= 60^(@) हो तो...

त्रिभुज `ABC ` में यदि `/_ C= 60^(@)` हो तो सिध्द कीजिए -
`(1)/(a+c) +(1)/(b+c) =(3)/(a+b+c)`

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