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[Post New]28 Mar 2008 16:31:41 IST
    Subject: Re:given:a+b+c=180;tan{(a+b-c)/4}tan{(b+c-a)/4}tan{(a+c-b)/4}=1RTP-1+cosa+cosb+cosc=
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nandinis_7 (16)

Cool goIITian

Olaaa!! Perrrfect answer. 2  [5 rates]
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total posts: 85    
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hey under what conditions can v use this method of universal substitution?
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