lim x tends to pi ((1+cos x)/(tan2x))
Kindly refer the similar link for your query.
https://www.meritnation.com/cbse/class11-science/textbook-solutions/math/rd-sharma-xi-(2015)/limits/page29.58-exercise-29.8-qno35/1265_6806_72433/
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https://www.meritnation.com/cbse/class11-science/textbook-solutions/math/rd-sharma-xi-(2015)/limits/page29.58-exercise-29.8-qno35/1265_6806_72433/
Regards