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![[Post New]](/templates/default/images/icon_minipost_new.gif) 4 Apr 2008 23:42:27 IST
Accepted Answer [?]
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First find out tan(15/2)
cotA + tanA = 2cosec2A
now use cotA - tanA = 2cot2A
That gives you tanA = cosec2A - cot2A
We can know the value of tan15 using the formula tan(pi/4-A)=[1-tanA]/[1+tanA]
Plugging in those values you get tan15/2 as (31/2-21/2)(21/2-1)
Now we need tan165/2 that's tan(pi-15/2)
That gives the answer to be exactly (31/2+21/2)(21/2+1)
~Cheerio!!!
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Talk less work more!! {To be simplistic and 2 gain respect}
Eat less work more!!! {To "build" ur body}
Work less Do more!!! {2 make ur life big}
don't get scared !!!
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