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![[Post New]](/templates/default/images/icon_minipost_new.gif) 14 Feb 2008 18:10:51 IST
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 sec 3x dx = secx sec 2x dx tan x =t sec2x dx = dt sec x =  1+t 2use the formula for 1+t 2 dt = (t 1+t 2 )/2 + 1/2(log (t+ 1+t 2) + c
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