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![[Post New]](/templates/default/images/icon_minipost_new.gif) 17 Jun 2008 19:36:14 IST
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It is very simple if u know the identity
tank.tan(60+k).tan(60-k)=tan3k
Now,put k=20,we have,tan20.tan80.tan40=tan60
Multiply tan60 on both sides to get the ans as tan260=3.
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MAKING A MISTAKE IS HUMAN BUT REPEATING IT IS IDIOTIC. |
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