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![[Post New]](/templates/default/images/icon_minipost_new.gif) 1 Nov 2007 16:59:32 IST
Accepted Answer [?]
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jst use secA = 1/ cosA
then apply 1 +cosA= 2 cos square A/2
then multiply n divide wid 2 power n
also divide n multiply wid sin square A / 2 n sin A
then u ll get the answer if u want a detailed solution nudge me then
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