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" 20.(i) "(sec theta-1)/(sec theta+1)=(s...

" 20.(i) "(sec theta-1)/(sec theta+1)=(sin^(2)theta)/((1+cos theta)^(2))

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Prove each of the following identities : (i) (sec theta -1)/(sec theta +1) =(sin^(2) theta)/((1+ cos theta)^(2) ) (ii) (sec theta - tan theta)/(sec theta + tan theta) = (cos^(2) theta)/((1+ sintheta)^(2))

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