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![[Post New]](/templates/default/images/icon_minipost_new.gif) 30 Mar 2008 04:59:54 IST
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There is no specific condition for using universal substitution. If the problem becomes very tough to solve using pure trigonometric concepts, and if u feel that converting the trigonometric equation into an arithmetic one helps, then u use the methods of universal substitution.
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Satyaram B V,
General Secretary, Mandakini Hostel,
IIT Madras |
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