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What is done in those two steps I had marked in attached image and please tell all the formulas applied

Rittik Mishra , 5 Years ago
Grade 12th pass
anser 1 Answers
Arun
Dear student
 
Please ask questions related to JEE only. As this question is of higher class, please ask this on respective forums.
 
Thanks and regards
Last Activity: 5 Years ago
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