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Nilanjan Bhowmick AIR 3, CSIR NET (Earth Science)
Jagat Chaudhary
use leibnitz to differentiate both sides of given expression. hence we get 1+ f(x)= e^x hence f(x)=e^x - 1 now use this f(x) in given inequality ans solve inequality as shown below. 1≤e^x-1≤2 2≤e^x≤3 take log both sides hence x€ [ log2 , log3] option (A)